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  Number and Math Play

Odd Balls
 
Q Suppose you have 7 balls and 2 paper bags. How can you put an odd number of balls into each bag?


 
A Put 3 balls in each bag (or put 1 ball in the first bag and five in the second). What about the seventh ball? Just don't put it into a bag at all!

Source: Usborne Brain Puzzles, p. 14