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In the entrance test of Wharton Business...

In the entrance test of Wharton Business School, the maximum marks for each of three papers is n and that for the fourth paper is 2n. Find the number of ways in which a candidate can get 3n marks.

A

1/6 (n+1)(n+2)

B

`1/6(n+1)(5n^2+10n+6)`

C

`1/2(n^2+3n-6)`

D

none of these

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The correct Answer is:
B
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