nattt9429 nattt9429

08-04-2018
Mathematics

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What is the sum of the first 14 terms of the sequence : an=6n-12

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mkryukova19 mkryukova19

08-04-2018

a1=6*1-12=-6 arithmetic sequence
a14=6*14-12=72
sum =n(a(1)+a(n))/2
sum =14*(-6+72)/2=462

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