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If a man has 3 different coloured plants...

If a man has 3 different coloured plants and 3 different coloured shirts. The number of ways that he can select a pair (I,e. one pant and one shirt is `3xx3=9` as explained below.
Let the plants be `P_1P_2,P_3` and shirts be `S_1,S_2,S_3`. He can select a pair from the following
`P_1S_1,P_1S_2,P_1S_3,P_2S_1,P_2S_2,P_2S_3,P_3S_1,P_3S_1,P_3P_2,P_3P_3`., 9 ways.

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