When are you supposed to use this formula- Tr+1= nCr .an-r .br ? And when should you use this formula- Tr+1 = (-1) nCr .an-r .(+b)r ? Share with your friends Share 0 Anuradha Sharma answered this First formula is used when we have to find the general term in the expansion of this type a+bn. Second formula is used when we have to find the general term in the expansion of this type a-bn. 0 View Full Answer Arohi Singhal answered this that formula is the general formula and we use it when we are given nth terms and have to find n or r and stuff like that.. u know if u open the book u cn get the application of this formula 0
