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Railways R.R.C. (Jabalpur) Solved Paper Held on 1st Shift 30-11-2014

  • question_answer
    What should come in place of question mark (?) in? \[{{9}^{4}}-{{9}^{2}}=....?...\]

    A) 729                              

    B) 81

    C) 6561                            

    D) 6480

    Correct Answer: D

    Solution :

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


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