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As part of a sales strategy, 20% of randomly chosen new internet service subscribers receive a getaway break prize from the subscriber

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As part of a sales strategy, 20% of randomly chosen new internet service subscribers receive a getaway break prize from the subscriber. If all 20 households in a particular housing estate subscribe, what is the probability that

(a) none of the households get the break;

(b) less than half of the households get the break;

(c) at least four of them get the break.