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Question


(n+1)C1+(n+1)C2+(n+1)C3+..+(n+1)Cn=

A
2(2n+1)
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B
2(2n1)
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C
2n+1
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D
(2n+11)
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Solution

The correct option is B 2(2n1)
As in the hint required expression + n+1C0+n+1Cn+1=2n+1
=> required. expression = 2n+12=2(2n1)

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