Find the sum of the first 20 terms of an arithmetic series if the first term is 10 and the twentieth term is 38.
1 answer:
Answer:480
Step-by-step explanation:
To find the sum of the first n terms of an arithmetic series use the formula, n terms of an arithmetic sequence use the formula,
Sn=n(a1 + an)2
n=20
a1= 10
a20=38
20(10+38)/2
20(48)/2
960/2
480
So the ans is 480
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