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JAMB - Mathematics (2005 - No. 39)
In how many ways can 6coloured chalks be arranged if 2 are same colour?
60
120
240
360
Forklaring
\(\frac{6!}{2!}=ways=\frac{6\times5\times4\times3\times2!}{2!}\\=6\times5\times4\times3\\=360\hspace{1mm}ways\)
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