1. If n is a whole number, then n2+n+11 is a prime number.
3 answers
Is this a true/false question?
False, all I need is one counter-example
let n = 11
then n^2 + n + 11
= 11^2 + 11 + 11
= 11(11 + 1 + 1)
= 11(13) <---- which cannot be prime, since I was able to factor it
let n = 11
then n^2 + n + 11
= 11^2 + 11 + 11
= 11(11 + 1 + 1)
= 11(13) <---- which cannot be prime, since I was able to factor it
x/x=1 where x is a real number provide counter example..
3 answers