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SSC GD Constable Number Ranking

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This page covers SSC GD Constable Number Ranking with complete concept notes, 15 graded practice MCQs, key points and exam-specific tips. Free to study.

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Concept Notes

Number Ranking— Rules & Concept

Core ConceptRead this first — the foundation of the topic

Number Ranking is a logical reasoning problem where you are given a series of numbers or positions, and you must determine the rank or position of a particular number or person in a sequence—either from left to right or right to left. CORE CONCEPT

In Number Ranking problems, you need to find where a number sits in a given order. The question might ask: 'What is the rank of number X from the left?' or 'If we reverse the sequence, what becomes the position of Y?' The key is to count carefully and apply simple directional rules. KEY RULES & PROPERTIES

1. Always identify the total count of numbers/items in the sequence. 2. Rank from left means counting from position 1 on the left side.

3. Rank from right means counting from position 1 on the right side (reverse counting). 4. If an item's rank from left is R, then its rank from right = (Total Count + 1) – R.

5. The middle position exists only if total count is odd. 6. Direction matters—left and right are opposite directions.

Formula BlockMemorise — at least one formula appears in every paper
Rank from Right = (Total Number of Items + 1) − Rank from Left
Rank from Left = (Total Number of Items + 1) − Rank from Right
Total Items = Rank from Left + Rank from Right − 1
Exam PatternsWhat examiners ask — read before attempting PYQs

SSC CGL typically asks: - Direct rank questions: 'Find rank of X from left/right' - Reverse rank questions: 'If reversed, what is position?' - Both-side rank: 'A is 5th from left and 8th from right. Find total count' - Position-based: 'How many items between positions?' SHORTCUT/TRICK Always use the formula: Rank from Right = (Total + 1) − Rank from Left. This avoids counting errors. If you know any two values (total and one rank), you instantly find the other.

Worked ExampleSolve this step-by-step before moving on
1
Step 1

Count total items = 8

2
Step 2

Identify rank of 60 from left = 5 (it's the 5th number)

3
Step 3

Apply formula: Rank from Right = (8 + 1) − 5 = 9 − 5 = 4 Answer: 60 is at rank 4 from the right. Verification: From right: 92(1st), 88(2nd), 75(3rd), 60(4th) ✓

Exam TrapsCommon mistakes students make — avoid these

Students often confuse rank with count. If 60 is 5th from left, it doesn't mean 5 items are to its left—only 4 items are to its left. Rank includes the item itself.

Key Points to Remember

  • Rank from Right = (Total Items + 1) − Rank from Left; memorise this formula.
  • Rank from left = counting from position 1 starting at leftmost item.
  • Rank from right = reverse counting from rightmost item as position 1.
  • If rank from left is R and total is T, items to the left = R − 1.
  • Items between two ranks = |Rank₁ − Rank₂| − 1 (subtract 1 to exclude both positions).
  • Direction change always uses the complement formula; direct counting saves time only for small lists.

Exam-Specific Tips

  • In a sequence of N items, if rank from left is L, then rank from right is always (N + 1) − L.
  • Number of items to the left of rank R = R − 1.
  • Number of items to the right of rank R = N − R.
  • If an item is 6th from left and 4th from right, total count = 6 + 4 − 1 = 9.
  • Middle position in a sequence of odd numbers (e.g., 7 items) = position 4.
  • Between rank 3 and rank 8 in a sequence, number of items = 8 − 3 − 1 = 4.
  • When a sequence is reversed, rank from left becomes rank from right in the new order.
  • Total items = Rank from Left + Rank from Right − 1 (this is a rearrangement of the main formula).
Practice MCQs

Number Ranking — Practice Questions

15graded MCQs · easy to hard · full solution & trap analysis

All MCQs →
Practice 1easy

In a row of 25 students, Rajesh is 8th from the left. What is his position from the right?

Practice 2easy

In a class ranking, Priya is 12th from the top and 19th from the bottom. How many students are in the class?

Practice 3easy

In a ranking of 50 employees, Vikram is ranked 18th. How many employees are ranked below him?

Practice 4easy

In a class of 40 students, Raj's rank from the top is 12th. What is Raj's rank from the bottom?

Practice 5easy

In a line of students, Neha is 7th from the left and Zara is 9th from the right. If there are 20 students in total and both are in the same line, how many students are between them?

Practice 6easy

In a queue of 40 people, Amit is 15th from the front. If 5 people leave the queue from behind Amit, what is Amit's new position from the front?

Practice 7medium

Seven friends are standing in a line. Priya is 3rd from the left. Ananya is 2 positions to the right of Priya. What is Ananya's position from the left?

Practice 8medium

In a class of 35 students, when students are ranked by marks, Vikram is 8th from the top. How many students rank below Vikram?

Practice 9medium

In a row of 25 students, Rajesh is 9th from the left end. Priya is 7 positions to the right of Rajesh. What is Priya's position from the right end?

Practice 10medium

In a row of 40 students, Rajesh is 12th from the left end. What is his position from the right end?

Practice 11hard

In a line of 48 students, Neha is 16th from the left. Aman is 12th from the right. How many students are standing between Neha and Aman?

Practice 12hard

In a queue of 50 people, Meera is 18th from the front. If 5 people leave from the front of the queue and 3 people join at the back, what is Meera's new position from the front?

Practice 13hard

In a ranking of 60 students, Vikram is 25th from the top. Shreya is 15 positions below Vikram. If 8 students are removed from the top and 4 students are added at the bottom, what is the difference between Shreya's new position from the top and her original position from the top?

Practice 14hard

In a row of 40 students, Rajesh is 12th from the left end. Priya is 8 positions to the right of Rajesh. What is Priya's position from the right end?

Practice 15hard

In a class of 35 students arranged in a line, Arun's rank from the left is 4 less than his rank from the right. What is Arun's position from the left end?

60-Second Revision — Number Ranking

  • Formula King: Rank from Right = (Total + 1) − Rank from Left. Write it once before exam starts.
  • Trap: Rank ≠ Count of items on one side. Rank 5 means 4 items to the left, not 5.
  • Quick Check: If rank from left is L and total is T, rank from right must be T + 1 − L; verify mentally.
  • Direction Matters: Left = normal order, Right = reverse order. Don't flip them.
  • Formula Rearrange: If given rank from left and right, find total = L + R − 1. Easy bonus question.
  • Middle Alert: In odd sequences (5, 7, 9 items), the middle rank = (Total + 1) ÷ 2.
  • Between Positions: Items between rank A and rank B = |A − B| − 1. Exclude endpoints.
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