Question

Find the sum of first 20 term of an arithematic sequence 3,8,13

Answer 1

Answer:

Explanation:

In this problem, a=3, r=8−3=5, n=20 and s20=?.

We will use the formula sn=n2(2a+(n−1)d)

s20=202(2(3)+(20−1)5)

s20=10(6+95)

s20=10(101)

s20=1010

Hopefully this helps!

Answer 2

Answer:

1010

Step-by-step explanation:

I ans your question in two way.

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