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From the data $1, 4, 7, 9, 16, 21, 25$, if all the even numbers are removed, then the probability of getting at random a prime number from the remaining is :
- (a)$\frac{2}{5}$
- (b)$\frac{1}{5}$
- (c)$\frac{1}{7}$
- (d)$\frac{2}{7}$
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Sol. (b) $\frac{1}{5}$