Binomial Expansion (1 Viewer)

[sunmoonlight]

How to do this question:
Find the ratio of the (r+1)th term to the rth term in the expansion of (a+b)^n.

 

[rainbowspoon1]

expand as Nc0a^nb^0 + Nc1a^n-1B^1 + ... + NcNa^0b^n and then pick a term to = r, and the followign one to = r+1 and divide r+1 by r? im not sure but thats what i would do?

 

[SB257426]

this is what i got... i did it in a bit of a rush so it might be wrong

 

[Luukas.2]

The only thing I see wrong is that the question sought the reciprocal of the ratio written here, i.e.:

​

 

[SB257426]

The only thing I see wrong is that the question sought the reciprocal of the ratio written here, i.e.:

​

Ah yes I made a silly mistake, I agree