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On the set N of all natural numbers defi...

On the set N of all natural numbers define the rational R by aRb iff the G.C.D. of a and b is 2. Then R is

A

1) Reflexive but not symmetric

B

2) symmetric only

C

3) reflexive and transitive

D

4) reflexive, symmetric and transitive

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The correct Answer is:
B
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