Question

2.Find the sum of first 20 terms of an A.P in which a=1 and 20th term = 58.​

Answer 1

Answer:

Step-by-step explanation:

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Solution :-

given :-

a = 1 , l = 58 , and n = 20

now , sum of 20 terms ,

S(20) = 20 /2 ( 1 + 58 ). "" [Sn = n /2 ( a + l )]

= 10 (59 )

= 590.

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