Question

Which is a counterexample that disproves the conjecture?



If n is a positive integer, then 2n – 1 is a prime number.



A.


n = 6


B.


n = 5


C.


n = 3


D.


n = 2


is it b?

Answer 1

@greenlegodude57

Answer 2

a=11
b=9
c=5
d=3

Answer 3

are thee any other choices?

Answer 4

thats not what it says

Answer 5

none of these are counterexamples

Answer 6

@iPwnBunnies

Answer 7

@SiennaSurfer Your values are correct, but I disagree with your conclusion.
To disprove the statement, your choice should be a non-prime number. Hence B.

Answer 8

a=6
b=5
c=3
d=2

it think its 5

Answer 9

b gives u a prime #

Answer 10

thank you