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07-12-2019
Mathematics

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Find the sum of the first 20 terms of an arithmetic series if the first term is 10 and the twentieth term is 38.

[Arithmetic Sequences]

Brainly if correct

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sufiiyan sufiiyan

07-12-2019

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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