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if ""^18C15 + 2(""^18C16) + ""^17C16 + 1...

if `""^18C_15 + 2(""^18C_16) + ""^17C_16 + 1 = ""^nC_3` then n = .....

A

19

B

20

C

18

D

24

Text Solution

Verified by Experts

The correct Answer is:
B
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