Direction: Study the information given below carefully and answer the questions that follow.

How many pairs of digits are there in the given number, that have as many numbers between them as in the series of natural numbers both in backward and forward direction?

5278643

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RRB Clerk Prelims Memory Based Paper (Held On: 10 August 2024 Shift 2)
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  1. Two
  2. Five
  3. Three
  4. Four
  5. Six

Answer (Detailed Solution Below)

Option 5 : Six
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Detailed Solution

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Given number: 5278643

F1 Savita Banking 13-8-24 D1

Thus, we get three pairs,

Forward → (5, 7), (5, 8), (7,8)

Backward → (3, 7), (4, 7), (3,4)

Therefore, there are four pairs which have as many numbers between them as in the original series of natural numbers. 

There are six such pairs. 

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