If (1-frac(1)(2)) (1-frac(1)(3)) (1-frac...

If `(1-frac(1)(2)) (1-frac(1)(3)) (1-frac(1)(4) ) _____ (1-frac(1)(40)) = frac(xx)(40)`, then x is equal to

A

`1`

B

`39`

C

`frac(1)(40)`

D

`2`

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