eternallyboreduser
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Why are the answers 40320, 20160 and 17280?
I did this:
a)8c4×4!×4c4×4!/2!=20160
b)1×7c3×4c4×4!×4!/2!=10080
c)1×7c2×4c4×4!×4!/2!=6048
8 ppl are to form 2 queues of 4, in how many ways can this be done if:
a)no restrictions
b)jim only stands in left queue
c)sean and liam must stand in the same queue
I did this:
a)8c4×4!×4c4×4!/2!=20160
b)1×7c3×4c4×4!×4!/2!=10080
c)1×7c2×4c4×4!×4!/2!=6048
8 ppl are to form 2 queues of 4, in how many ways can this be done if:
a)no restrictions
b)jim only stands in left queue
c)sean and liam must stand in the same queue