How many 4digits grater than 5000 can be formed from digits 356789?
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.when repeatation are allowed, the 1st place can be filled in 2 ways by nos 5 and 7.If 1st place be 5 ,the 2nd place can be filled in 5 ways. 3rd place also can be filled in 5 ways.similarlly 4th place will be filled in 5 ways. But since the no. should be greater than 5000 =5*5*5 -1 =124 . If the 1st place be 7 then the total nos. which can be formed=5^3=125.
Hence total sample space =124125=249
the no of favourable event i.e. nos. divisible by 5 =99
probablity=99/249
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