there are thousand sealed envelope in a box ten of them contain a cash prize of greater than hundred each and hundred of them contain a cash prize of greater than 50 eats and 200 of them contain attached price of greater than 10 each understood not contain any cash prize if they are well shuffled and an envelope is picked up out then the probability that it contains no cash prizes is??
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Total number of sealed envelopes in a box, n(S) = 1000
Number of envelopes containing cash prize = 10 + 100 + 200 = 310
Number of envelopes containing no cash prize,
n(E) = 1000 - 310 = 690
⇒ P(E) = 0.69
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