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OpenStudy (anonymous):
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OpenStudy (anonymous):
What is the sum of the multiples of 4 from 16 to 100?
OpenStudy (anonymous):
Do you know anything about Geometric progression?
OpenStudy (anonymous):
no not really
OpenStudy (anonymous):
\[16+20+24+\cdots+96+100\] \[4x_1=16\\ 4x_2=20\\ \vdots\\ 4x_n=100\] Clearly, 4 is a common ratio between successive terms. If you were to find x_1 and x_n, you'll be able to set up your summation's index: \[\large\sum_{k=?}^?4^k\] Does that kinda help?
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