A bomber want to destroy a bridge.Two bombs are sufficient to destroy it .If four are dropped,what is the probability that it is destroyed, if the chance of a bomb hitting the target is 0.4

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Q. A bomber wants to destroy a bridge. Two bombs are sufficient to destroy it. If four bombs are dropped, what is the probability that it is destroyed, if the chance of a bomb hitting the target is

0.4

,
If the answer is

\frac{a}{b}

(HCF of

a

and

b

1

), then find

b - a

Q. The probability of a bomb hitting a bridge is

1 / 2

. Two direct hits are needed to destroy it. The number of bombs required so that the probability of the bridge being destroyed is greater that

0.9

Q. The probability of a bomb hitting a bridge is

\frac{1}{2}

and two direct hits are needed to destroy it. The least number of bombs required so that the probability of the bridge beeing destroyed is greater then 0.9, is

The probability of a bomb hitting a bridge is $\frac{1}{2}$ 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 then 0.9, is

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

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