What is the value of 10!! (double factorial)?

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A 3628800
B 3840
C 55
D 110

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Answer: B. 3840

The double factorial n!! multiplies every second number down from n. For 10: 10 x 8 x 6 x 4 x 2 = 3840. 3628800 is 10!, the ordinary factorial.

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What is the value of 10!! (double factorial)?

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