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The probalility that a lamp in a class r...

The probalility that a lamp in a class room will be burn out is 0.3. Six such lamps are fitted in the class room. It is Known that the class room is unusable if the number of lamps burning in it is less than four, then probability that the class room cannot be used on a random occasion is

A

0.9245

B

0.9259

C

0.09245

D

0.09259

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The correct Answer is:
A
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