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1. If x and y are prime numbers, which of the following cannot be the sum of x and y?
- A. 5
- B. 5
- C. 5
- D. 5
Answer: Option D
Explanation:
5=2+3, possible
9=7+2, possible
13=11+2, possible
So, only option left is 23 and it cannot be the sum of x and y.
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