cards marked with numbers 1,2,3,......,40 are placed in a box and mixed thoroughly. one card is drawn at random from the box. find the probability that the number on the drawn card is a) divisible by 3 and 5 b) a prime number c) a perfect square
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https://www.meritnation.com/ask-answer/question/27-cards-are-marked-with-numbers-3-4-5-50-are-placed/probability/8822283
https://www.meritnation.com/ask-answer/question/pls-explain-me-cards-marked-with-numbers-1-3-5-101-are-p/probability/6470706
https://www.meritnation.com/ask-answer/question/cards-marked-with-numbers-1-2-3-40-are-placed-in-a-box/probability/7058490