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It is not except when n = 1.
7 factorial, (7!) is equal to 5,040.
10 factorial is equal to 10 x 9 x 8 x 7 x 6 x 5 x 4 x 3 x 2 x 1 = 3628800 seconds. One week is equal to 60 x 60 x 24 x 7 = 604800 seconds. Therefore, 10 factorial seconds is equal to 3628800/604800 = 6 weeks.
It is 4060.