GRE
The tens digit of ($$4^{100}$$)($$5^{99}$$)
The tens digit of ($$4^{100}$$)($$5^{101}$$)
20!+19!+18!
400(18!)
x
$$\frac{5}{2}$$
y+z
$$x^{2}+(\frac{1}{x})^{2}$$
$$(x+\frac{1}{x})^{2}$$
$$\frac{M(a^{2}+b^{2})}{12}$$
$$\frac{M(a+b)^{2}}{12}$$
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