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Q.

If A=2, 4, 5, B=7, 8, 9, then n(A×B) is equal to

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a

6

b

9

c

3

d

0

answer is B.

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Detailed Solution

A×B=2, 7, 2, 8, 2, 9, 4, 7, 4, 8, 4, 9, 5, 7,5, 8, 5, 9n(A×B)=n(A).n(B)=3×3=9
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