perplexus.info :: Numbers : Another last digit

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

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

Submitted by Federico Kereki

Rating: 2.5000 (4 votes)

Solution: (Hide)

All powers of 11 end in 1. 7 times 13 ends in 1, so 7^2004 times 13^2004 ends in 1. So the final digit of the product is the final digit of 13, that is, 3.

Comments: ( You must be logged in to post comments.)

Subject	Author	Date
Alternative Methodology	K Sengupta	2008-04-25 07:09:20
Puzzle Solution	K Sengupta	2007-07-18 01:16:36
sol	Praneeth Yalavarthi	2007-07-17 08:32:27
No Subject	doremi	2004-10-29 20:34:01
Simpler yet!	Tristan	2004-09-07 18:02:52
Simpler or not?	Gamer	2004-09-07 17:02:46
re: Simple Solution !	nikki	2004-09-07 10:11:32
Solution - explained	nikki	2004-09-07 10:09:53
Simpler solution	Oskar	2004-09-07 07:01:06
Simple Solution !	Syzygy	2004-09-07 06:55:25

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