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The probability of a bomb hitting a brid...

The probability of a bomb hitting a bridge is `1/2` and two direct hits are needed to destroy it. The least number of bombs required so that the probability of the bridge being destroyed is greater than 0.9, is :

A

7 bombs

B

3 bombs

C

8 bombs

D

9 bombs

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The correct Answer is:
A
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DISHA PUBLICATION-PROBABILITY-PRACTICE EXERCISE (STANDARD LEVEL)
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  10. If two events A and B are such that P(A')=0.3, P(B)=0.4 and P(A nn B')...

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  12. Let 0ltP (A)lt1, 0ltP(B) lt1and P(A uu B)=P(A)+P(B)-P(A)*P(B) then (A...

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