Question 732503
here you need to use combinations, the items do not have to be in any particular order, just rearrange them in the same sequence


{{{nCr=n!/(n-r)!r!}}}


{{{7C2=7!/(7-2)!2!}}}


{{{7C2=7!/(5!2!)}}}


{{{7C2=5040/(120*2)}}}


{{{7C2=5040/240}}}


{{{7C2=21}}}