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Consider two matrices $M_1$ and $M_2$ with $M_1^*M_2=0$ and $M_1$ is non singular. Then which of the following is true?

1. $M_2$ is non singular
2. $M_2$ is null matrix
3. $M_2$ is the identity matrix
4. $M_2$ is transpose of $M_1$

when we multiply any matrix with null matrix we always get null matrix

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