Answer:
b , 2/5
Explanation:
Prime no. is no. that has only 2 factor so b/n 1 and 20 the prime no. are 2, 3, 5, 7, 11, 13, 17, 19 so they are 8 in no.
The probablity will be 8/20 = 2/5 so the answer is b
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