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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 the 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 :

1. 164
2. 240
3. 82
4. 120

Correct answer: 120

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