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27 September, 08:51

Prove the divisibility of the following numbers: 10^9+10^8+10^7 by 555

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  1. 27 September, 09:11
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    Factor out 10^7: 10^7 (10²+10+1) = 111*10^7

    write 10^7 into (2*5) ^7: = 111*5^7^2^7

    =555*5^6*2^7

    yes, 10^9+10^8+10^7 is divisible by 555
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