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 then 0.9 is

The probability of a bomb hitting a bridge is (2)/(3) . Two direct hits are needed to destroy the bridge. The minimum number of bombs required such that the probability of bridge being destroyed is greater than (3)/(4) , is

The probability of a bomb hitting a bridge is (2)/(3) . Two direct hits are needed to destroy the bridge. The minimum number of bombs required such that the probability of bridge being destroyed is greater than (3)/(4) , is

The probability of a bomb hitting a target is 0.2. Two direct hits are necessary to destroy a bridge. If six bombs are aimed at the bridge, find the probability that the bridge is destroyed.

The probability of a missile hitting a target bridge is 1/5 . Two missiles are enough to destroy a bridge. If six missiles are fired at the bridge, the chance of the bridge being destroyed is __________.

The probabilty of hitting a target is 1/3. The least number of times to fire so that the probability of hitting the larget atleast once is more than 90% is

If probability of hitting a target is 1/10 , Then number of shot required so that probability to hit target at least once is greater than 1/4 .

A man can hit a target 2 times out of every 3 shots. The least number of times he must shoot, so that the probability of hitting the target at least twice is more than 0.9 is