Question

Let f(x) be defined for any positive integer x greater than 2 as the sum of all prime numbers less than x. For example, f(4)=2+3=5 and f(8)=2+3+5+7=17. What is the value of f(86)−f(82)?

Answer 1

f(86)-f(82)

Explanation:

well f of 82 = 2 plus _ plus _ plus _ and f of 86 is 2+_+_+_ subtract them

(A) 3 (B) 4 (C) 47 (D) 59 (E) 83

these are some possible answers so the answer is b, 4

btw, 86-82 = 4 duh

Answer 2

Answer: (E) 83

Step-by-step explanation: bc i put in the answer and got it correct .-.

also it says half credit bc i used too many tries o.O