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Mathematics, 06.12.2020 01:10 laurentsofia09
Use \large S_n=\frac{n}{2}\left(a_1+a_n\right) or \large S_n=\frac{n}{2}\left(2a_1+d\left(n- 1\right)\right) to find the sum of the arithmetic series when,
\large a_1=35, \large a_n=105, and \large n=8
Sum =
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You know the right answer?
Use \large S_n=\frac{n}{2}\left(a_1+a_n\right) or \large S_n=\frac{n}{2}\left(2a_1+d\left(n- 1\right...
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