Math, asked by albert428, 1 year ago

68. If 18C15 + 2(18C16) + 17C16 +1 = "C3, then n=
(a) 20
(b) 19
(C) 18
(d) 24

Answers

Answered by Anonymous

2

Step-by-step explanation:

a)20 by using first term=nCn-1= 20C19

third term is

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