CodingBat sumBetween

sumBetween

Given two integers, find the sum of the integers between those two numbers, including those two numbers. The first number will always be less than or equal to the second number.

sumBetween(3, 5) → 12
sumBetween(0, 1) → 1
sumBetween(1, 10) → 55

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Difficulty: 200

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