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  4. : Let A= x: x is a prime factor of 240 B= x: x is the sum of any two prime factors of 240 . Then

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Q. : Let $A=\{x: x$ is a prime factor of 240$\}$ $B=\{x: x$ is the sum of any two prime factors of 240$\}$. Then

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Solution:

$240=2 \times 3 \times 5 \times 8$
So $A=\{2,3,5\}, B=\{5,7,8\}$.
Clearly $8 \in A \cup B$.