In how many ways can 6coloured chalks be arranged if 2 are same colour?
A
60
B
120
C
240
D
360
Verified Correct Answer: D.
Step-by-Step Mathematical Solution
\(\frac{6!}{2!} = ways
=\(\frac{6\times5\times4\times3\times2!}{2!}\)
= 6\(\times5\times4\times3\)
= 360ways
Source: Myschool Past Questions Archive (Record #8612)