A box contains cards numbered from 1 to 20 a card is drawnat random from the box find the probility that no on the drawn card is 1 a prime no 2 a composite no
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n(s) = 20
let P(E)1 be the event of getting a prime number :
P(E)1 = n(E)1 / n(s)
= 8/20 = 4/5
probability of getting a composite number
1 - 4/5
= 5-4/5
= 1/5
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