Question

Sally made the conjecture that the sum of any two prime numbers is a prime number.

Which equation is a counterexample to her conjecture?

A.
2 + 5 = 7

B.
2 + 11 = 13

C.
15 + 4 = 19

D.
3 + 11 = 14

Answer 1

I think it's B.

Answer 2

Ok, prime numbers are numbers that have no other multiples other than 1 and itself. For example: 7 is a prime number because it only has factors of 7 and 1.

Answer 3

Ye.

Answer 4

Nope, not B.

Answer 5

Why not?

Answer 6

Sally said that the outcome would be a prime number, but we're trying to find a counterexample, meaning an example that proves her wrong.

Answer 7

Ah! Thank you. Then it's D.

Answer 8

No problem! And yes, you'e correct. *throws confetti in the air* yaaaaay cx

Answer 9

i SO smART

Answer 10

yeessshhhh. So very smert cx

Answer 11

The 'Number Line' question was incorrect.

Answer 12

:o Which answer did you choose?

Answer 13

D.

Answer 14

It was B.

Answer 15

Welp. I have to retake ity.

Answer 16

Oh I see xD I thought you put 2 points away from fraction \[1\frac{ 4 }{ 5 }\]

Answer 17

stoopid me xD

Answer 18

Oosies xp