What is the sum of the different positive prime factors of 640?	Choose the correct answer
A) 5 B) 7 C) 10 D) 15 E) 17
The prime factorization of 640   = 64 * 10   = 2^6 * 2*5   The sum of the different positive prime factors = 2+5= 
<gadget id="calculator">2+5</gadget>
<output>7</output>
7   The answer is 7.
<result>B</result>
What is the sum of the different positive prime factors of 640?