GRE
AC
AB
$$\frac{a}{a-1}$$
$$\frac{a+1}{a}$$
The average (arithmetic mean) of $$r$$, $$s$$ and $$t$$
$$\frac{1}{3}$$
x
y
The sum of the 200 values of f
The sum of the squares of the 200 values of f
r
12
$$T_5$$
$$(3^{11}) T_{16}$$
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