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Question:

The $\Lambda^0$ cannot decay by the following reactions. What conservation laws are violated in each of the reactions?

1. $\Lambda^0 \nrightarrow$ n + $\pi^-$
2. $\Lambda^0 \nrightarrow$ p + $\textrm{K}^-$
3. $\Lambda^0 \nrightarrow \pi^+ + \pi^-$

Source: Giancoli, Douglas C., Physics: Principles with Applications, 7th Edition, 2014.