Question

If nC12=nC8 then find the value of nC17
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Answer 1

Answer:

we have for nCr=n Cn-r

nC12=nC8

n-12=8

or n=20

then nC17

=20 C17

=20C 20 -17

=20 C3

=20.19.18

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3.2.1

= 20.57

=1140