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JEE MATHEMATICS MCQ: PERMUTATIONS

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Let

n_1=x_1 x_2 x_3

and

n_2=y_1 y_2 y_3

be two 3-digit numbers, then the pairs of

n_1

and

n_2

can be formed, so that

n_1

can be subtracted from

n_2

without borrowing, is

View answer and explanation

Correct option: C

45 \cdot(55)^2

Option C (

45 \cdot(55)^2

) is the correct answer because it represents the total number of ways to form the pairs

n_1

and

n_2

such that

n_1

can be subtracted from

n_2

without borrowing.

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