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Four person independently solve a certain problem correctly with probabilities `1/2,3/4,1/4,1/8dot` Then the probability that he problem is solve correctly by at least one of them is `(235)/(256)` b. `(21)/(256)` c. `3/(256)` d. `(253)/(256)`

A

`(235)/(256)`

B

`(21)/(256)`

C

`(3)/(256)`

D

`(253)/(256)`

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A
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