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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