MCQ
The image of point $(0,0,-4)$ in $x y$ plane is :
- A$(0,0,0)$
- ✓$(0,0,4)$
- C$(0,0, \pm 4)$
- DNone of these
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A bag contains 5 black balls, 4 white balls and 3 red balls. If a ball is selected randomwise, the probability that it is black or red ball is: