Question 30

How many such pairs of digits are there in the number 75938462, each of which has as many digits between them in the number as they have between them when arranged in ascending order?

Solution

Original number: 75938462

Rearranged number: 23456789

So now we can see that the pairs which have the same number of digits between them before and after rearrangement are
79,53,58,36 Since we have figured out 4 such pairs, only feasible option is option 5

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How many such pairs of digits are there in the number 75938462, each of which has as many digits between them in the number as they have between them when arranged in ascending order?

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