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Another last digit (Posted on 2004-09-07)

What's the last digit of 11^2003 times 7^2004 times 13^2005 ?

See The Solution Submitted by Federico Kereki

Rating: 2.5000 (4 votes)

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Simpler solution

| Comment 2 of 10 |

11^2003x7^2004x13^2005 = (11x7x13)^2003x7x13^2 = 1001^2003x7x169. The last digit of 1001^2003 is 1, so the last digit of the whole product is 3, the last digit os 7x169.

Posted by Oskar on 2004-09-07 07:01:06

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