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Four person independently solve a certai...

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
a.`(235)/(256)`
b. `(21)/(256)`
c. `3/(256)`
d. `(253)/(256)`
Answer - A

A

`235/256`

B

`21/256`

C

`3/256`

D

`253/256`

Text Solution

Verified by Experts

P (at least one of them solves correctly) = 1 -P (none of them solves correctly)
`=1-(1/2xx1/4xx3/4xx7/8)=235/256`
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