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There are 3 boxes numbered B(i=1,2,3) ...

There are 3 boxes numbered `B(i=1,2,3)` each having 10 balls also numbered from 1 to 10. Three balls are selected one from each box. If number on ball selected from `B` box is `n` such that `n_1 lt n_2 lt n_3` then the number of ways equal to (A) `.^(10)C_3` (B) `.^(10)C_2` (C) `2.^(10)C_2` (D) `2.^(10)C_3`

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