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Question

Let A={x:x is a prime factor of 240} and B={y:y is the sum of any two prime factors of 240}. Then which of the following options is true?

A
5AB
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B
7AB
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C
8AB
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D
8AB
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Solution

The correct option is D 8AB
A={x:x is a prime factor of 240}
240=24×3×5
A={2,3,5}

B={y:y is the sum of any two prime factors of 240}
B={5,7,8}
AB={2,3,5,7,8}
and AB={5}

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