There is a ZERO probability that a randomly selected number from 30 to 61 is divisible by 7 and then divisible by 20 after replacing first.
Probability is defined as the ratio of the number of favourable outcomes to the total number of outcomes in other words the probability is the number that shows the happening of the event.
The numbers divisible by 7 between 30 and 61 are:-
{ 35,42,49,56 }
After replacing them:-
{ 53,24,94,65 }
There is not any number divisible by 20 after replacing.
Therefore there is a ZERO probability that a randomly selected number from 30 to 61 is divisible by 7 and then divisible by 20 after replacing first.
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