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What is the sum of the series? ​ 5∑i=1 4i ​

1 Answer

5 votes

Answer:

60

Explanation:

∑[i=1,5] 4i = 4·1 + 4·2 + 4·3 + 4·4 + 4·5

= 4 + 8 + 12 + 16 + 20

= 60

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