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sumRange


Compute the sum of the integers between a and b inclusive. This range of values can be specified in any order, so a does NOT have to be less than b. sumRange(2,0) -> 2 + 1 + 0 -> 3


sumRange(1, 2) → 3
sumRange(2, 1) → 3
sumRange(-3, -10) → -52

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def sumRange(a,b):

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