GRE
$$x^{2}$$+$$\frac{1}{x^{2}}$$
$$x^{3}$$+$$\frac{1}{x^{3}}$$
The remainder when n(n+1)(n+2) is divided by 6
1
x-y
z+t
The average of the least and greatest numbers in list S
6
$$\frac{r}{x}$$
n-2
n
52
d
s
The number of integer solutions of the equation $$3x^{2}+5x-2=0$$
$$r-p$$
$$t-s$$
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