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What's the sum Sn of the first n terms of this given sequence? 1, 1+2, 1+2+3, 1+2+3+4, ... The kth term is 1+2+3+ ... +k = (I also attached a picture of the question. Thanks!) ​
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What's the sum Sn of the first n terms of this given sequence?

1, 1+2, 1+2+3, 1+2+3+4, ...
The kth term is 1+2+3+ ... +k =

(I also attached a picture of the question. Thanks!)
​

What's the sum Sn of the first n terms of this given sequence? 1, 1+2, 1+2+3, 1+2+3+4, ... The-example-1
User Cohen
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2.8k points

1 Answer

4 votes

Answer:
(k(k+1))/(2)

Explanation:

This is a standard formula.

User OptimusPrime
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