Write the sum using summation notation, assuming the suggested pattern continues. 3 - 15 + 75- 375 ...

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22-05-2018
Mathematics

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Write the sum using summation notation, assuming the suggested pattern continues. 3 - 15 + 75- 375 ...

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CastleRook CastleRook · Answer 1 · 2018-06-01T12:55:48+02:00

CastleRook CastleRook

01-06-2018

The sum notation for the series given will be found as follows:
3 - 15 + 75- 375 ...
the common ratio is:
-15/3=-5

the first term is:
a=3
thus the summation notation will be:
Sn=(from i=1 to n)∑a(-5)⁽ⁿ⁻¹⁾

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