- #1
jmc
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Homework Statement
Three tanks are sent to shoot a certain target. Each tank is to shoot one round. The
probabilities of a tank's round hitting the target are 1/2, 2/3 and 3/4 for tanks A, B, and C
respectively. Assuming independence of A, B and C hitting, find the probability that:
a. rounds from all three of the tanks hit the target.
b. rounds from exactly 2 tanks hit the target
c. the target is hit at least once
2. Homework Equations
I'm don't know where to start/which eqn's a relevant for this type of problem.
The Attempt at a Solution
a. P{A}=0.5, P{B}=2/3, P{C}=0.75. Since all are independent events, P{hitting the target}=P{A}*P{B}*P{C}
b. To me, it seems it would have to be one of P{A+B}, P{B+C}, or P{A+C}.
I'm not sure how to make the math 'choose' which one though, and what formula to use to do that.
c. Not sure how to proceed to think about solving it. :?