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Another last digit (Posted on 2004-09-07) Difficulty: 1 of 5
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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Solution Simpler yet! | Comment 6 of 10 |

Instead, consider (11*7*13)^2003 *7*169.  The last digit of 11*7*13 is 1, so the last digit of the total product is 7*9 mod 10=3.

Er, I guess I didn't see Oskar's solution there.

Edited on September 7, 2004, 11:43 pm
  Posted by Tristan on 2004-09-07 18:02:52

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