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Divisibility by 7 (Posted on 2005-05-22) Difficulty: 2 of 5
(2222^5555 + 5555^2222) is or isn't divisible by 7 ?

Just pencil and paper.

See The Solution Submitted by pcbouhid    
Rating: 2.0000 (3 votes)

Comments: ( Back to comment list | You must be logged in to post comments.)
re(2): Big numbers are NO PROBLEM for divisibility | Comment 6 of 8 |
(In reply to re: Big numbers are NO PROBLEM for divisibility by Ravi Raja)

Hi Ravi,

I agree with you technically.

However I try to avoid using formulae whenever possible. This is why you will see that in the solution I posted, I haven't used a single formula or term that (even) a 8th grade student won't understand.

Thanks for reminding the formula. In cometitive exams these formulae come out handy.  

Rupesh


  Posted by Rupesh Khandelwal on 2005-05-25 15:43:38
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