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A person goes for an examination in whic...

A person goes for an examination in which there are four papers with a maximum of n marks from each paperr. The number of ways in which one can get 2n marks, is

A

`1/3 (n^2-5n+4)`

B

`1/3 (n+1)(2n^2+4n+3)`

C

1/6 (n+1)(n+4)

D

none of these

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The correct Answer is:
B
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