Google means $10^{100}$

A Cross Product Formula

$$\mathbf{V}_1 \times \mathbf{V}_2 = \begin{vmatrix} \mathbf{i} & \mathbf{j} & \mathbf{k} \\\ \frac{\partial X}{\partial u} & \frac{\partial Y}{\partial u} & 0 \\\ \frac{\partial X}{\partial v} & \frac{\partial Y}{\partial v} & 0 \end{vmatrix}$$

The probability of getting $k$ heads when flipping $n$ coins is

$$P(E(n,k);p) = {n \choose k} p^k (1-p)^{ n-k}$$