There are 20 balls which are red, blue or green. If 7 balls are green and the su

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โœช Choose the correct option.

There are 20 balls which are red, blue or green. If 7 balls are green and the sum of red balls and green balls is less than 13, at most how many red balls are there?

A. 4
B. 5
C. 6
D. 7

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