Let $P(n): 2+2^2+2^3+\ldots+2^n=2^{n+1}-2, n \in N$. Then,
- A$P(m)$ is true $\Rightarrow P(m+1)$ is true
- B$P(n)$ is true for all $n \in N$
- C$P(n)$ is true for all $n \geq 20$
- D$P(n)$ is true for all $n \leq 10$
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