When are you supposed to use this formula- Tr+1nCr .an-r​ .br ?

And when should you use this formula- Tr+1 = (-1) nC.an-r .(+b)r ?

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
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
What are you looking for?