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If a=2 and d=4 , then s_{20} = _______.

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If $a = 2$ and $d = 4$ , then $s_{20} =$ _______.

800

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Chloe Discussed

a = 2

and

d = 4

, then

s_{20} =

_______.

6 mins ago

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6 mins ago

Text solutionVerified

As we know that the sum of first

n

terms,

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

, where

a

d

are the first term & common difference of an AP.

Since,

a = 2, d = 4, S_{20} = ?

∴ S_{20} = \frac{20}{10} [2 a + (20 - 1) 4]

S_{20} = 10 [4 + 76]

S_{20} = 800

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