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$P$ and $Q$ are two integers such that $P \times Q = 64$. Which of the following cannot be the value of $P+Q$?

1. $20$
2. $65$
3. $16$
4. $35$

Possible values of P,Q are (1,64), (2,32), (4,16), (8,8)

Possible values of P+Q are 65, 34, 20, 16

35 is not possible. Hence, option D would be the answer
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