⌊5.9⌋ +4!!+3#

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A 21
B 13
C 17
D 19

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Answer: D. 19

The floor of 5.9 is the greatest integer not above it, 5. The double factorial 4!! = 4 x 2 = 8. The primorial 3# is the product of primes up to 3, 2 x 3 = 6. So 5 + 8 + 6 = 19.

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⌊5.9⌋ +4!!+3#

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