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What's the sum of the first 100 positive integers? How about the first 1000? Learn the fun and fast way to solve problems like this. See more

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You love marbles and start collecting them. You have 2 marbles initially and add the same number of marbles to your store each day. If you have 17 marbles total after 5 days, then how many marbles did you add each day?

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A frog is on the bottom of an empty well \(108\text{ m}\) deep. It climbs up the well \(3\text{ m}\) during the daytime and slips down \(1\text{ m}\) at nighttime. What is the number of days it takes for the frog to be out of the well?

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