1+2+3+4+5+6+7...+75= cara jawabnya gmn?.... Question from @kriris27

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kriris27 @kriris27

October 2018 2 25 Report

1+2+3+4+5+6+7...+75=
cara jawabnya gmn?

mamadsantoso Jawab.annya 25 karena 75 - hasil darri titik

0 votes Thanks 0

ImmanuelSinaga Beda = 1
suku awal = a = 1
suku ke n = 75

$\displaystyle S_n~=~\boxed{\bold{\frac{n}{2}~\times~(a~+~U_n)}} \\\\\\ \\ \displaystyle S_{75}~=~\bold{\frac{75}{2}~\times~(1~+~75)} \\ \\ S_{75}~=~\frac{75}{2}~\times~76 \\ \\ S_{75}~=~75~\times~38 \\ \\ S_{75}~=~2.850$

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