If "C12= "Cs, then "c, equals:
2556
306
153
None of these
Answers
Answered by
0
Answer:
Correct option is
D
20
n
C
12
=
n
C
8
12!(n−12)!
n!
=
8!(n−8)!
n!
12×11×10×9×8!(n−12)!
1
=
8!(n−8)×(n−9)(n−10)(n−11)(n−12)!
1
⟹(n−8)(n−9)(n−10)(n−11)=12×11×10×9
∴n−8=12
n=8+12
n=20
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