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This is an arithmetic series, so we use the formula S=n/2 (a+l) when n is the number of terms, a is the first number and l the last.

S = 100/2 (51 + 150) =50 (201) = 10050

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8y ago
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8y ago

You can use the formula for the sum of an arithmetic series for this type of question.

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Q: What is the sum of all the numbers from 51 to 150?
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