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The coefficient of t^4 in ((1-t^6)/(1-t)...

The coefficient of `t^4` in `((1-t^6)/(1-t))^3` (a) `18` (b) `12` (c) `9` (d) `15`

A

12

B

15

C

10

D

14

Text Solution

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The correct Answer is:
B
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