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Let A={(n,2n):ninN} and B={(2n,3n):ninN}...

Let `A={(n,2n):ninN} and B={(2n,3n):ninN}`. What is `AnnB` equal to ?

A

`{(n,6n):ninN}`

B

`{(2n,6n):ninN}`

C

`{(n,3n):ninN}`

D

`phi`

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The correct Answer is:
D
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