OJ Board

I have a question about this problem. could somebody answer me,please?

n=1 ,t=0.3

f(1,1)=1.357 = (1.25-t)/(1-t)

and what's the answer of n=2 ,t=0.3 ?

I think that f(2,1) is ((1.25-t)/(1-t))^2 ,but I am wrong.

can somebody answer me ? thx