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SSC Sample Paper SSC CHSL (10+2) Sample Test Paper-1

  • question_answer
    If a = 4011 and b = 3989 then value of ab =?

    A)  15999879                      

    B)  15899879

    C)  15989979        

    D)         15998879

    Correct Answer: A

    Solution :

     \[a=4011,\,\,b=3989\] \[\therefore \]      \[ab=4011\times 3989\]             \[=(4000+11)(4000-11)\]             \[={{(4000)}^{2}}-{{(11)}^{2}}\]             \[=16000000-121\]             \[=15999879\]


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