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JEE MATHEMATICS MCQ: COMBINATIONS

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Application +4 | -1

Consider three boxes, each containing 10 balls labelled 1, 2, …, 10. Suppose one ball is randomly drawn from each of the boxes. Denote by

{n_i},

the label of the ball drawn from

i

th box, (i = 1, 2, 3). Then, the number of ways in which the balls can be chosen such that

{n_1} < {n_2} < {n_3}

is

View answer and explanation

Correct option: B

120

Option B (120) is correct because it's the number of ways to choose 3 distinct numbers from 1 to 10, which is a combination problem.

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n