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OpenStudy (anikate):
find the sum of the first 50 terms of the following series: 12+21+30+39+...
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OpenStudy (anikate):
@Calcmathlete
OpenStudy (anonymous):
\[S_n = \frac n2(2a_1 + (n - 1)d)\]
OpenStudy (anonymous):
Can you manage from here?
OpenStudy (anikate):
can you plz substitute and show me.
OpenStudy (anonymous):
\[S_{50} = \frac{50}{2}[2(12) + (50 - 1)9]\]
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OpenStudy (anonymous):
Can you do it now?
OpenStudy (anikate):
yup thx
OpenStudy (anonymous):
np :)
OpenStudy (anikate):
just needed formula
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