Posted by **Lana Von Monroe** on Tuesday, April 10, 2012 at 10:43pm.

The chart below shows an expression evaluated for four different

values of x

x: x2+x+5:

1 7

2 11

6 47

7 61

Josiah concluded that for all positive values of x, x2+x+5 produces a prime number. Which value of x serves as a counterexample to prove Josiah’s conclusion false?

A: 5

B: 11

C: 16

D: 21

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