Do you know subtraction??

Probability Level pending

Let n 1 = x 1 x 2 x 3 a n d n 2 = y 1 y 2 y 3 n_1= x_1x_2x_3\quad and \quad n_2= y_1y_2y_3 be two 3-digit numbers.How many pairs of n 1 n_1 and n 2 n_2 can be formed so that n 1 n_1 can be subtracted from n 2 n_2 without borrowing?


The answer is 136125.

Gautam Sharma by Gautam Sharma , 23, India

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