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Original Question
What is the sum of a 10–term arithmetic sequence where the first term is 3 and the last term is 75?Asked by brianna
What is the sum of a 22–term arithmetic sequence where the first term is 56 and the last term is –28
Answers
Answered by
Reiny
sum(n) = n(first + last)/2
= 22(56-28)/2
=308
= 22(56-28)/2
=308
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