A) \[7+7+7+\_\_\_\_\]to 8 times
B) \[8+8+8+\_\_\_\_\]to7 times
C) (\[7+7+7+\_\_\_\_\]to 8 times) + (\[8+8+8+\_\_\_\_\]to 7 times)
D) Both [a] and [b]
E) None of these
Correct Answer: D
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