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Let N be the set of natural numbers and ...

Let N be the set of natural numbers and for `a in N`, aN denotes the set `{ax : x in N}`. If `bNnncN=dN`, where b, c, d are natural numbers greater than 1 and the greatest common divisor (GCD) of b and c is 1, then d equals

A

max {b,c}

B

min {b,c}

C

bc

D

b+c

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The correct Answer is:
C
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