Mathematics

In how many ways can 6coloured chalks be arranged if 2 are same colour?

In how many ways can 6coloured chalks be arranged if 2 are same colour?
  • A.
    60
  • B.
    120
  • C.
    240
  • D.
    360
Correct Answer: Option D
Explanation

(frac{6!}{2!}=ways=frac{6times5times4times3times2!}{2!}\=6times5times4times3\=360hspace{1mm}ways)