## statistics, probability help please !

1. The problem statement, all variables and given/known data

In a certain high-risk group, the chance of a person having suffered a heart attack is 70%. If four persons are chosen from the group, find the probability that at least one will have had a heart attack.

2. Relevant equations

(work shown below) these would be dependent

3. The attempt at a solution

(.7)/(4) = 2.8

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 It might be easier to think of the chance that a specific individual doesn't have a heart attack, so what are the chances that none of the individuals have heart attacks (and you might want to rethink the dependence).
 your answer is wrong i don think it is a dependent event the probability of a person with heart attack is 0.7 so the probability that among 4 at least 1 has heart attack = 1 - probability that none have = 1 - (0.3)$^{4}$ must be correct but verify it