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The life in hours of a ratio tube is con...

The life in hours of a ratio tube is continuous random variable with pdf
`f(x)={{:((100)/x^2","xge100),(0",""else where"):}`
Then, the probability that the life of tube will than 200 h if it is known that th tube is still functioning after 150 h of services is

A

`1/4`

B

`1/3`

C

`1/2`

D

none of these

Text Solution

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The correct Answer is:
A
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