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If aN={ax:x in N(natural number)} then 3...

If aN={ax:x in N(natural number)} then `3N cap 7N` is equal to

A

21N

B

10N

C

4N

D

14N

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The correct Answer is:
A
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PATHFINDER-SETS AND RELATIONS-QUESTION BANK
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  5. If for two sets A and B,A-B=A then which of the following is true?

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  11. For any two nonempty sets A and B ,(Acup B)' cup (A'cap B) is equal to

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  12. If A={0,1} and B={0,-1} then show that AxxB ne BxxA

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  17. If mRn={(m,n):(m-n) is divisible by 5} then find (3Rn)cap(5Rn)

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