JAMB - Mathematics (2005 - No. 39)

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

120

240

360

\(\frac{6!}{2!}=ways=\frac{6\times5\times4\times3\times2!}{2!}\\=6\times5\times4\times3\\=360\hspace{1mm}ways\)