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Five numbers added together in pairs produce: 0, 2, 4, 4, 6, 8, 9, 11, 13, 15 What are the five numbers?

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Negative Dice

Weekly Problem 16 - 2012
If the odd numbers on two dice are made negative, which of the totals cannot be achieved?

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Sum One Special

Weekly Problem 1 - 2007
Three integers have a sum of 1 and a product of 36 - what are they?

Minus One Party

Stage: 3 Short Challenge Level: Challenge Level:1

Calculate $[(-1) + (-1)^2 ]\div [(-1)-(-1)^2]$
 
If you liked this problem, here is an NRICH task which challenges you to use similar mathematical ideas.  

This problem is taken from the UKMT Mathematical Challenges.

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