GRE
$$\frac{M(a^{2}+b^{2})}{12}$$
$$\frac{M(a+b)^{2}}{12}$$
The number of tables occupied by only 1 person
9
$$\frac{(a+b)^{2}-b^{2}}{a+2b}$$
$$a$$
t
s
The number of integers in S in which all three digits are different
60
$$\frac{r}{t}$$
$$0$$
The least possible value of $$\frac{3x-4}{y+7}$$
$$\frac{2}{5}$$
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