⭐Sum of the first 10 terms is - 80 and that of next 10 terms is - 280.Find AP⭐❌NO SPAM ❌BEST ANSWER WILL BE MARKED AS BRAINLIEST ✔️

⭐Sum of the first 10 terms is - 80 and that of next 10 terms is - 28

1.	⭐Sum of the first 10 terms is - 80 and that of next 10 terms is - 280.Find AP⭐❌NO SPAM ❌BEST ANSWER WILL BE MARKED AS BRAINLIEST ✔️
Answer» LET a is the first TERM and d is the common difference of AP now use FORMULA, Sn=n/2{2a+(n-1) d} now S10=10/2 {2a+(10-1) d} -80=5 (2a+9d) 2a+9d =-16 ---------------(1) again S20-S10=-280 20/2 {2a+19d} +80=-280 10 (2a+19d)=-360 2a+19d=-36 -----------------(2) solve both equation d=-2 a=1 hence 1, -1,-3,-5 ........ hope helps you ❤️❤️❤️

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⭐Sum of the first 10 terms is - 80 and that of next 10 terms is - 280.Find AP⭐❌NO SPAM ❌BEST ANSWER WILL BE MARKED AS BRAINLIEST ✔️

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