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Prove that sum(r=0)^ssum(s=1)^n^n Cs^n C...

Prove that `sum_(r=0)^ssum_(s=1)^n^n C_s^n C_r=3^n-1.`

A

`3^(n)-1`

B

`3^(n)+1`

C

`3^(n)`

D

None of these

Text Solution

Verified by Experts

The correct Answer is:
A
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