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""^(m)C(r+1)+ sum(k=m)^(n)""^(k)C(r) is ...

`""^(m)C_(r+1)+ sum_(k=m)^(n)""^(k)C_(r)` is equal to :

A

`""^(n)C_(r+1)`

B

`""^(n +1)C_(r +1)`

C

`""^(n)C_(r-1)`

D

`""^(n)C_(r-1)`

Text Solution

Verified by Experts

The correct Answer is:
B
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Knowledge Check

  • sum_(r=0)^(n)(P_(r))/(r!) is equal to

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    D
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  • sum_(r=0)^(n) (""^n C_r)^2 =

    A
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