SOLUTION: Find the sum of the first n terms of the following arithmetic sequence.
a1 = 2, d = 2; n = 5.
Algebra.Com
Question 380157: Find the sum of the first n terms of the following arithmetic sequence.
a1 = 2, d = 2; n = 5.
Answer by rfadrogane(214) (Show Source): You can put this solution on YOUR website!
Find the sum of the first n terms of the following arithmetic sequence.
a1 = 2, d = 2; n = 5.
Sol'n:
S = n/2[2a1+(n-1)d]
= (5/2)[2(2)+(5-1)2]
= (5/2)[4+8]
= (5/2)(12)
S = 30 --answer
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