A box contains 40 envelopes of which 25 are ordinary and 15 are unstamped. The number of

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A box contains 40 envelopes of which 25 are ordinary and 15 are unstamped. The number of unstamped ordinary envelopes is 10. What is the probability that an envelope chosen at random from the box is a stamped non ordinary envelope?

 

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A box contains 40 envelopes of which 25 are ordinary and 15 are unstamped. The number of
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