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Math Help - Plzz reply urgent!!!

  1. #1
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    Plzz reply urgent!!!

    find the remainder if 8^401 is divided by 13
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  2. #2
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    Re: Plzz reply urgent!!!

    Do you know Fermat's little theorem?

    8^12 = 1 mod 13

    8^401 = (8^12)^33 (8^5)
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  3. #3
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    Re: Plzz reply urgent!!!

    yes i know the theoremm... i wanted to check the answer which i got
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  4. #4
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    Re: Plzz reply urgent!!!

    Quote Originally Posted by tejashree24 View Post
    yes i know the theoremm... i wanted to check the answer which i got
    Then you should have posted it.

    BTW it's easy to check it yourself.

    8^401 mod 13 - Wolfram|Alpha
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  5. #5
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    Re: Plzz reply urgent!!!

    yes thank you for the same...
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  6. #6
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    Re: Plzz reply urgent!!!

    also... i have one more question
    solve the following system of equations using matrix inversion method :
    3x+y+2z=3
    2x-3y-z=-3
    x+2y+z=4

    I'm having a paper tomorrow.. plz send me the steps if you can
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