How many pair of digits can be formed in the number 73915243, which have same number of digits between them as in the number seri…

Question

How many pair of digits can be formed in the number 73915243, which have same number of digits between them as in the number series (both forward and backward direction)?

1. A. None
2. B. Two
3. C. Three
4. D. More than three (Correct answer)
5. E. One

Correct Answer

Option D — More than three

Detailed Solution & Explanation

The correct answer is More than three.

Key Points

• Number: 7(1)3(2)9(3)1(4)5(5)2(6)4(7)3(8).
• Pairs with same count between them in the number as in natural series: (7,9)=1 digit between, (3,1)=2 digits between, (9,5)=1, (1,2)=3 between, (5,4)=1, (2,3)=1 → more than 3 qualifying pairs.