(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

sum of first 11 terms of Ap is 17 and sum of first 17 terms is 11

find the sum of first 28 terms?

2. Relevant equations

Sum=n/2[2a+(n-1)d]

3. The attempt at a solution

i tried solving it by using obove formula but i am not able to do so as the value of d is coming in fraction

**Physics Forums | Science Articles, Homework Help, Discussion**

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: Find the sum of first 28 terms?

**Physics Forums | Science Articles, Homework Help, Discussion**