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Find the 5th term in the expansion of (a+b)^8 in simplest form
The order isn't specified though
If we assume they meant the decreasing order for the powers of a
Then it should be 8 choose 5
use the binomial theorem
$(x+y)^{k}=\displaystyle\sum_{k=0}^{n}(_{n}^{k}) x^{k}y^{n-k}$