max041014p0ta9s max041014p0ta9s

30-07-2019
Mathematics

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30-07-2019

Take the average of the first and last terms, and multiply by the number of terms.
A) there are 14 terms.
Average(-3,62)=29.5
14(29.5)=413
B) 10 terms
Average(sqrt(3),18sqrt(3))=9.5sqrt(3)
10*9.5sqrt(3)=95sqrt(3)

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