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Math Help - divisibility

  1. #1
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    Exclamation divisibility

    I need to prove this
    d0 + 10d1 + ... +(10^k)dk +(10^k-1)dk-1 = d0 - d1 + d2-d3+. +(-1)^kdk (mod 11)

    and deduce a test for divisibility by 11.

    plz can someone help me asap
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  2. #2
    o_O
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    Done here: Divisible 11 proof
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