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Problems Reducible to Linear Equations in 2 Variables

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Question

There were 400 tickets sold for a school raffle. Jerry bought 20 of them. Find the probability that one of Jerry's tickets will be the first one drawn. ___ Give the answer up to 2 decimal places

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Solution

Required probability = $\frac{20}{400}$ = $\frac{1}{20}$ = 0.05

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