JEE MATHEMATICS MCQ: PERMUTATIONS

1 Easy

1 of 1

Application +4 | -1

Let

m

and

n

be two digit natural numbers. The number of pairs

(m, n)

such that

n

can be subtracted from

m

without borrowing is:

View answer and explanation

Correct option: A

2475

Option A (2475) is correct because it is the number of pairs (m, n) where the digits of n are less than or equal to the corresponding digits of m, calculated as the product of sums.

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