Register
Let Sn, be the sum of the first n terms of the arithmetic series 2+4+6+.... (a) Find (i) S4 (ii) S100 Answer: 10 100 How do you work it out though?​
147k views
0 votes
Let Sn, be the sum of the first n terms of the arithmetic series 2+4+6+....

(a)
Find
(i)
S4
(ii) S100

Answer: 10 100
How do you work it out though?​

User Isius
by
6.7k points

1 Answer

6 votes
i) 20
ii) 19900

formula : sn = n/2[2a+(n-1)d ]
User Il Vic
by
7.3k points
Ask a Question
Welcome to QAmmunity.org, where you can ask questions and receive answers from other members of our community.

7.6m questions

10.2m answers

Other Questions

What is .725 as a fraction
How do you estimate of 4 5/8 X 1/3
i have a field 60m long and 110 wide going to be paved i ordered 660000000cm cubed of cement  how thick must the cement be to cover field
Write words to match the expression. 24- ( 6+3)
A dealer sells a certain type of chair and a table for $40. He also sells the same sort of table and a desk for $83 or a chair and a desk for $77. Find the price of a chair, table, and of a desk.
Link Copied!