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If m,n,r are positive integers such that...

If m,n,r are positive integers such that `rltm,n,` then:
`""^(m)C_(r)+""^(m)C_(r-1)""^(n)C_(1)+""^(m)C_(r-2)""^(n)C_(2)+ . . ..+""^(m)C_(1)""^(n)C_(r-1)+""^(n)C_(r)` equals:

A

`(""^(n)C_(r))^(2)`

B

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

C

`""^(m+n)C_(r)+""^(m_C_(r)+""^(n)C_(r)`

D

none of these

Text Solution

Verified by Experts

The correct Answer is:
B
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