A) 540
B) 680
C) 700
D) 720
Correct Answer: D
Solution :
\[1\xrightarrow{\times 2}2\xrightarrow{\times 3}6\xrightarrow{\times 4}24\xrightarrow{\times 5}120\xrightarrow{\times 6}\mathbf{720}\]
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