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प्रश्न
A box contains 20 cards marked with numbers 1 to 20. One card is drawn at random. Event A is the number of the card which is multiple of 5. Write S, n(S), A and n(A).
उत्तर
S = {1,2,3,4,.......20}
n(S) = 20
A = The number on the card is multiple of 5
A = {5,10,15,20}
n(A) = 4
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