Hi, Could someone help me solve this, please. Show by Induction that for n >= 1: (3^(3n)) + (2^(n+2)) is divisible by 5 Thanks.
Last edited by mr fantastic; August 20th 2009 at 03:14 AM.
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Originally Posted by justmaths Hi, Could someone help me solve this, please. Show by Induction that for n >= 1: (3^(3n)) + (2^(n+2)) is divisible by 5 Thanks. True for n = 1. Assume true for n = k. Show that under the assumption it's true for n = k + 1: and it should be clear how to finish things off.
Oh I see. Then we let the last bracket equal a number divisible by 5. Thanks.
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