In how many ways can 6coloured chalks be arrang... - JAMB Mathematics 2005 Question
In how many ways can 6coloured chalks be arranged if 2 are same colour?
A
60
B
120
C
240
D
360
correct option: d
\(\frac{6!}{2!}=ways=\frac{6\times5\times4\times3\times2!}{2!}\=6\times5\times4\times3\=360\hspace{1mm}ways\)
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