WBJEE 2020 Math Solved Paper

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Question : 21 of 75

Marks: +1, -0

If C0,C1,C2,......C15 are the Binomial co-efficients in the expansion of (1+x)15, then the value of

C1

C0

+2

C2

C1

+ 3

C3

C2

+....+15

C15

C14

is

1240
120
124
140

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