i guess it would be ....   0.7 + 0.3*0.6 + 0.3*0.4*0.5 + 0.3*0.4*0.5*0.4
=.964.....correct me if i am wrong.??

On Mon, Aug 29, 2011 at 5:34 PM, Naman Mahor <naman.ma...@gmail.com> wrote:

> An anti aircraft gun can fire four shots at a time. If the probabilities of
> the first, second, third and the last shot hitting the enemy aircraft are
> 0.7, 0.6, 0.5 and 0.4, what is the probability that four shots aimed at an
> enemy aircraft will bring the aircraft down?
>
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