Mathematics
xiaowen
17

Let an integer be chosen at random from the integers 1 to 30 inclusive. Find the probability that the integer chosen is divisible by 4 or is greater than 25 and less than 30.

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(1) Answers
azzariza20

A:4*7=28. so there are 7 multiples upto 30. P(A)=7/30 B:26,27,28,29 i.e. 4 numbers satisfy the 2nd criteria. P(B)=4/30 P(A∩B)=1/30 (since 28 belongs to both A&B) P(A∪B)= P(A)+P(B)-P(A∩B)= (7+4-1)/30= 1/3  

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