If aN=ax:x belong N. Describe the set 3N intersection 7N .

Answers (1)

Solution:     3N=3x:xin N=3,6,9,12,15,........

                   7N=7x:xin N=7,14,21,28,.......

               	herefore     3Ncup 7N=21,42,63.........=21x:xin N=21N.

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