sandy wrote:

Which of the following integers CANNOT be expressed as the sum of two prime numbers?

A. 8

B. 9

C. 10

D. 11

E. 12

To solve, we can analyze each answer choice.

A) 8

Since 5 + 3 = 8, and both 5 and 3 are prime, answer choice A is not correct.

B) 9

Since 7 + 2 = 9, and both 7 and 2 are prime, answer choice B is not correct.

C) 10

Since 7 + 3 = 10, and both 7 and 3 are prime, answer choice C is not correct.

D) 11

Since two prime numbers CANNOT SUM TO 11, answer choice D is correct.

Since we have a correct answer, we can stop at answer choice D.

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