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if ((n),(r)) + ((n),(r-1)) = ((n + 1),(x...

if `((n),(r)) + ((n),(r-1)) = ((n + 1),(x)),` then x = ....

A

n - r

B

r + 1

C

n

D

n - r + 1

Text Solution

Verified by Experts

The correct Answer is:
D
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