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5 votes
Find the sum.
5 + 6 + 7 + ... + 11​

1 Answer

6 votes
5+6+7+8+9+10+11=56
and that's the answer
There's also a formula (5+11)/2*7=56 (you take the average of the first and last terms and multiply that by the number of terms)
User Khustochka
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