Question

Add up the first 10 terms of the arithmetic sequence: {1,4,7,10,13,…}

Answer 1

Answer:

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Step-by-step explanation:

Okay, so we’ll have to find the sum up to 20 terms of this sequence.

the difference(d) between the consecutive terms is 3(4–1,7–4,10–7)

n=20 as we’ll have to find the sum up to 20 terms.

the first term is 1(a)

Now we will use the formula for finding sum up to a particular term i.e.

n[2a+(n-1)d]/2

n=20, d=3,a=1

using the formula we get the answer - 590

Answer 2

First 10 terms are: 1,4,7,10,13,16,19,22,25,28

Sum=145

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