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A lottery. Played 50 tickets for 1 ruble

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0.59 $ · 50 RUB · 0.51 €
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0.59 $

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A lottery. Played 50 tickets for 1 ruble

A lottery. Played 50 tickets for 1 ruble. It is known that among the 30 winning tickets 1 rub., 2 - 10 rubles. Purchased 2 tickets. Calculate the expectation of net income.

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