11^2=121,so,121*x^2=aabb,x^2=81 is not good ,64 is OK.
121*64=7744.
• good for a few guesses; but not for a lot guesses. -皆兄弟也- ♂ (0 bytes) () 06/17/2010 postreply 01:14:11
• Yes,we can cancel 81,49,36,25,16 by number theory. -jinjing- ♀ (0 bytes) () 06/17/2010 postreply 16:13:58