Four Goodness Sake

Stage: 2 Challenge Level: Challenge Level:3 Challenge Level:3 Challenge Level:3

Fours.

You might have worked on this first problem before:

Use 4 four times with simple operation symbols so that the answer 12 is arrived at.

Now, can you redo this so that you get 15, 16 and 17 for your answers?

Need more of a challenge? Try getting answers all the way from 0 through to 10.


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Published November 2001.