Asked by indira
After 3 red buttons on a pattern, 4 black buttons are placed. After using 15 red buttons. how many black buttons are used?
Answers
Answered by
PsyDAG
Think it again.
3 red, 4 black, 3 red, 4 black, 3 red, 4 black, 3 red, 4 black, 3 red, 4 black.
3 red, 4 black, 3 red, 4 black, 3 red, 4 black, 3 red, 4 black, 3 red, 4 black.
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