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