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Four sevens and one one. (Posted on 2010-09-06) Difficulty: 1 of 5
Using four sevens (7,7,7,7) and a one (1) create the number 100.
You can use not more than three out of the usual mathematical operations (+, -, x, /, sqrt and power) and any amount of brackets.

See The Solution Submitted by Ady TZIDON    
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re: remember it is a D1 - SPOILER | Comment 5 of 7 |
(In reply to remember it is a D1 - SPOILER by Ady TZIDON)

Yeah, it's D1. However I would bet there are people who did not realize that was the solution. I thought it was a fun problem because I did not get it immediately.
  Posted by Gamer on 2010-09-07 05:17:10

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