Question
Show that $C_1+C_2+C_3+\ldots . .+C_n=2^n-1$
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| Elementary events: | $W1$ | $W2$ | $W3$ | $W_4$ | $W_5$ | $W_6$ | $W_7$ |
| $\frac{1}{7}$ | $\frac{1}{7}$ | $\frac{1}{7}$ | $\frac{1}{7}$ | $\frac{1}{7}$ | $\frac{1}{7}$ | $\frac{1}{7}$ |
B – C
${ }^{80} C_2$
$(1+3 x)^{-1 / 2}$