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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?​
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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
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