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If  aN={ax:xN} and bNcN=dN , where b ,cN  are relatively prime, then

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By Expert Faculty of Sri Chaitanya
a
d=bc
b
c=bd
c
b=cd
d
None of these

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detailed solution

Correct option is A

bN= the set of positive integral multiples of b, cN  = the set of positive integral multiplies of c.   ∴ bN∩cN= the set of positive integral multiples of bc                       = dN⊂N ,   [  b,c are prime]


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