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Question

C0−C1+C2−C3+..........+(−1)n Cn is equal to

A
2n
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B
2n1
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C
0
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D
2n1
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Solution

The correct option is A 0
C0C1+C2C3++(1)nCnC0=nC0;nC1=C1(1x)n=nC0|nnC1x+nC2x2++(1)nnCnxnx=10=nC0nC1+nC2++(1)nCn Hence, (C) is the correct option.

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