Question 1135861
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Let N be the set of all integers from 1 to 200, inclusively.


Let E be the subset in N consisting of all even numbers. 
The number of elements in E is  {{{200/2}}} = 100.


Let T be the subset in E, consisting of numbers of E divisible by 5.
It is clear that the set T consists of all integer numbers divisible by 10, and the number of elements in T is 20.


The problem asks : if the integer is randomly chosen from E, what is the probability that it belongs to T ?


Since the set T is the subset in E and has in five times less elements than E, the answer is  <U>OBVIOUS</U> :  this probability is  {{{1/5}}}.
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Answered and solved.