Question

How many pairs of digits are there in the number 6315784, each of which has as many digits between them in the number as when the digits are rearranged in descending order?

Options

• None

• One

• Two

• Three

Answer 1

Three
Explanation:
Given number,

     
6    3    1     5     7    8     4
     
Descending order,
               
8   7    6    5   4    3    1
                   

Hence, there are three such pairs 7- 8, 3 - 5, and 1- 3.