Question

there are 1000 sealed envelopes in a box,10 of them contain a cash prize of Rs.100 each,100 of them contain a cash of Rs.50 each and 200 of them contain a cash prize of Rs.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

Answer 1

Total number of envelopes =1000
No of envelopes that contains no prize =1000-(10+100+200)=1000-310=690
Therefore probability =690/1000=69/100
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Answer 2

Answer:

Step-by-step explanation:

Number of envelopes=1000

Rs 100= 10 envelopes

Rs 50= 100 envelopes

Rs 10= 200 envelopes

Hence, total number of envelopes that contain cash prize= 310 envelopes.

Now,

Number of envelopes that don't contain any prize=1000-310

                                                                                   =690.

P(getting an envelope that does not contain cash prize)= 690/1000=69/100.

Best of luck!!!