Question

If an = {ax: a = n) then find 2n3n ( an = {ax:a e n) 06 2nn3n foof)
Ans. (a) 5n (b) n (c) 6n (d) None ​

Answer 1

Answer:

According to the given notation,

3N={3x:x∈R}={3,6,9,12.......}

and 7N={7x:x∈R}={7,14,21,28,35,42,.......}

Hence 3N∩7N={21,42,63}

={21x:x∈N}=21N

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