Hi there, these aren't homework questions. I came across them during revision and couldn't solve them. So any help would be appreciated. The ans for the 1st image is 2 and second image is 3. For the first image, I attempted to calculate the Req for 10k and 20k resistors connected to V1 since they are parallel. And then to get Vo, I took (1+R2/R1)(V1) but I got (1+2)(1)=3 instead. Where have I gone wrong? For the second image, i tried using superposition principle by killing 2V to get Voutput due to 1V then killing 1V to get Voutput due to 2V. I got Vo(due to 1V)=(1+20/20)(1)= 2 and Vo(due to 2V)=(1+20/20)(2)= 4 so adding them would be 6V but the answer is 3V.Where have I gone wrong? Thank you for reading this and helping me!