Find the sum of first 30 terms of AP: -30, -24, -18, ...... | VSA 2m | Maths | SuperPadhai

Arithmetic Progressions > Question

VSA2 marksYear: 2022EasyCBSE Class 10

arithmetic-progressionssum-of-n-terms

Question

Find the sum of first 30 terms of AP:

- 30, - 24, - 18, ...

Solution

1

Here

a = - 30

,

d = 6

,

n = 30

+1 mark

2

S_{30} = \frac{30}{2} (- 60 + 29 \times 6) = 15 (- 60 + 174) = 15 \times 114 = 1710

+1 mark

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