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Question

Is C11C22+C33C44+...+(1)n1.Cnn =1+12+13+14+...+1n ?

A
True
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B
False
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Solution

The correct option is A True
(1+x)n=nC0+nC1x++n(Cnxn)
Integrate both sides
(1+x)n+1n+1=nCox+nC1x22++nCnxn+1n+1
Now put x from -1 to 0 (limits)

1n+1=c0C12+C23+(1)nCnn
1n+11+12+13++1n


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