Question

What is the series in Expanded Form?

Answer 1

short answer D

Explanation:

Answer 2

∴ ∑₁⁸i = 1 + 2 + 3 + 4 + 5 + 6 + 7 + 8

Explanation:

Given:

To Find:

∑₁⁸i =?

Solution:

Σ This symbol called Sigma means "summation up"

∴ ∑ n mean sum for all n

But if ∑₁³n means Sum for n=1 , 2 ,and 3 ADD

∴ ∑₁³n = 1 + 2 + 3

∴ ∑₁⁸i = 1 + 2 + 3 + 4 + 5 + 6 + 7 + 8