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13 July, 17:50

Prove that:

25^9+5^17 is divisible by 30

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  1. 13 July, 21:02
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    25^9+5^17=

    =2^18 + 5^17

    =5^17 (5+1)

    =5^17· 6

    =5^16 ·30 is divisible by 30
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