which expression defines the given series for seven terms -13+(-16)+(-19)+...

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17-07-2017
Mathematics

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which expression defines the given series for seven terms -13+(-16)+(-19)+...

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amirreza688 amirreza688 · Answer 1 · 2017-07-17T03:40:33+02:00

amirreza688 amirreza688

17-07-2017

for summing the terms of an arithmetic series use this
[tex] \frac{( 2a_{1} +(n-1)d)n}{2} [/tex]
a1 is the first term and d is the difference between second and first term

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