75. Exemplar Exercise Problem XXXIV

There are \(1000\) sealed envelopes in a box, \(10\) of them contain a cash prize of \(₹100\) each, \(100\) of them contain a cash prize of \(₹50\) each and \(200\) of them contain a cash prize of \(₹10\) each and rest do not contain any cash prize. If they are well shuffled and an envelope is picked up out, what is the probability that it contains no cash prize?

 

The probability of selecting envelopes without a cash prize is $\frac{i}{i}$.