# How many missiles should be fired?

Question asked by: thiliniiw

Asked on: 11 Jul 2010

OK so the probabilities you have are: 0.7 per hit and want to make sure greater than 0.995 in total.

Let's say you fire two. The probability both miss is 0.3 x 0.3, which is 0.09, so a 0.91 that one hits. Not enough.

With three is 0.3 x 0.3 x 0.3 = 0.027 so still not enough. Just keep on multiplying 0.3 x itself until you find which multiple is less than 0.005 and then you will have your answer.

By: knowitall

Replied at: 11 Jul 2010

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