Find the sum of first twenty terms of Arithmetic series 2+7+12+… using suitable formula.

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Find the sum of first twenty terms of Arithmetic series 2+7+12

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Find the sum of first twenty terms of Arithmetic series $2 + 7 + 12 + \dots$ using suitable formula.

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Sebastian Discussed

Find the sum of first twenty terms of Arithmetic series

2 + 7 + 12 + \dots

using suitable formula.

8 mins ago

Discuss this question LIVE

8 mins ago

We know, Sum of

n

terms is

S_{n} = \frac{n}{2} [2 a + (n - 1) d]

a =

First term

= 2

d =

Common difference

= 7 - 2 = 5

n =

number of terms

= 20

S_{20} = \frac{20}{2} [2 (2) + (20 - 1) 5]

S_{20} = 10 [4 + 95]

S_{20} = 10 (99)

S_{20} = 990

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Question Text	Find the sum of first twenty terms of Arithmetic series $2 + 7 + 12 + \dots$ using suitable formula.
Answer Type	Text solution:1
Upvotes	151