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There are 66 numbers from 11 to 76 inclusive. Take the top number plus the bottom number, 11 + 76 = 87

Now take 12 + 75 = 87, and a pattern emerges.

Repeat this over and over again, and you will have done it 33 times, half of 66.

(a+b)*(n/2) where n is the number of items in the list.

87 * 33 = 2871 ■

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Q: What is the sum of the integers from 11 to 76 inclusive?
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