Thanks FiveMack.
Actually I tried to prove that 3x^4 +5x^2 +7
was divisible by 15. This could indeed be false,
when x is a multiple of 3 and/or 5.
David
And THX Mally  a successful puzzle :)
Look forward to the next!
Last fiddled with by davieddy on 20070708 at 20:28
