Question

​What is the sum of the series?

​∑j=152j​



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Answer 1

Hope this helps

Explanation:

Sum of series is donated by the for formula below

`\sf \: Sn = (n)/(2) [2a + (n - 1)d]`

Example 3,6,9,12,...

Let's say we're finding the sum of the 20 series

n = 20, a = 3, d = 6-3 = 3

Where,

n means number of terms

a means the first term

d means the constant value between terms

S20 = 20/2[2(3) + (20-1)d]

S20 = 10[6+19(3)]

S20 = 60 + 570

S20 = 630

Voila!!