Question

Three sets of twins are to pose for photographs. How many photographs are possible if each set of the twins are to stand close to each other?

Answer 1

Choose the order of pairs from left to right – there are $3!=6$ ways. In each pair choose the order of twins – there are $2\cdot 2\cdot 2=8$ ways. The total number of ways is $6\cdot 8=48$