Plz help out
Here is the link for the answer to a similar query:
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https://www.meritnation.com/ask-answer/question/meritnation-expert-please-answera-bag-contains-20-balls-mark/probability/2035735
https://www.meritnation.com/ask-answer/question/find-the-probability-that-a-number-selected-at-random-from-t/probability/3285990