1.

""^15C_2 + 2.""^15C_3 + 3. ""^15C_4 + …..+ 14.""^15C_15 =

Answer»

`13.2^14 - 1`
`13.2^14 + 1`
`12^14 + 1`
`12^14 - 1`

ANSWER :B


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