Question

i have a question

2. Which is a counterexample that disproves the conjecture?

If n is a positive integer, then 2^n – 1 is a prime number.
(Points : 1)
n = 6
n = 5
n = 3
n = 2

i think the answer is 6

Answer 1

does that say
\[2n-1\] or
\[2^{n-1}\]

Answer 2

the second one

Answer 3

then your job is to compute
\[2^5-1\\
2^4-1\\
2^3-1\\
2^2-1\] and see which of those is not a prime number

Answer 4

its
A

Answer 5

2^6-1

Answer 6

\[2^2-1=3\] prime
\[2^3-1=7\] prime
\[2^4-1=15\] hmmm

Answer 7

2^4-1 is not one of them

Answer 8

oh oops

Answer 9

\[2^6-1=64-1=63\] yeah, pick that one

Answer 10

ok thank you

Answer 11

A cube has a surface area of one hundred fifty square yards. What is the length of a side? a) five yards b) twelve point five yards c) twenty-five yards d) thirty-seven point five yards

Answer 12

medal in return

Answer 13

plzzz

Answer 14

some one

Answer 15

hold on ok

Answer 16

@maylineb13

Answer 17

k

Answer 18

the answer is a=5

@maylineb13