• question_answer What should come in place of question mark (?) in? ${{9}^{4}}-{{9}^{2}}=....?...$ A) 729                              B) 81C) 6561                            D) 6480

${{9}^{4}}-{{9}^{2}}={{9}^{2}}\,\,({{9}^{2}}-1)$ $=81\times 80$ $=6480$