Find the number of ways of selecting 6 out of 10 subjects for an examination
-
A.
128 -
B.
216 -
C.
215 -
D.
210
Correct Answer: Option D
Explanation
(^{10}C_6 = frac{10!}{(10-6)!6!}\
=frac{10!}{4!6!}\
=frac{10times 9times 8 times 7 times 6!}{4times 3times 2times 1 times 6!}\
=210)