the sum of first 20terms of an ap 1,4,7,10 is
Share
Sign Up to our social questions and Answers Engine to ask questions, answer people’s questions, and connect with other people.
Login to our social questions & Answers Engine to ask questions answer people’s questions & connect with other people.
[tex][ tex ]\huge\purple{\mathbb{Answer ࿐}}[/tex][/tex]
[tex]Let a be the first term and d be the common difference of the given A.P.
Then, we have a=1 and d=3
we have to find sum of 20 terms of the given A.P.
Putting a=1,d=3,n=20 in Sn=2n{2a+(n−1)d}, we get
S20=220{2×1+(20−1)×3}=10×59=590
[/tex]
S = 590
Step-by-step explanation:
Please refer the above image and mark this answer as brainliest answer.