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16-04-2020
Mathematics

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5. (6 points) Find the sum of the series represented by:
∑3 − 5 6 =1

5 6 points Find the sum of the series represented by 3 5 6 1 class=

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wiitong0394703 wiitong0394703

16-04-2020

Answer:

-9

Step-by-step explanation:

split the sequence to 3∑i - ∑5

the first is use formula

∑i = i*(i+1)/2

and ∑5 = 5i

subtract

6*7/2 - 5*6 = -9

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