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

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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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Deependra Verma

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