Question

Consider the following definition.
Definition. An integer n is sane if
3 | (n2 + 2n).
Give a counterexample to the following: All odd integers are sane.
n =

Answer 1

3 | (n^2 + 2n)

Answer 2

have u tried it yet?

Answer 3

i mean try some odd numbers like 1,3,5,... and see if that statement is true all the time or not ??

Answer 4

ok let me try

Answer 5

I tried 3 and 2 and they are both wrong

Answer 6

how about 5?

Answer 7

5 is good.. how did u figure that out??

Answer 8

just trying odd numbers :) i tried 1,3,5

Answer 9

because the problem says odd numbers, u tried 2 that was unnesessary

Answer 10

thanks mukushla!!

Answer 11

yw malia :)

Answer 12

i have one more problem coming!! :)

Answer 13

i will try to help u if i can :)