Mathematics

Find the number of ways of selecting 6 out of 10 subjects for an examination

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)