SOLUTION: A can solve 75% while B can solve 70% of problems of a book.what is the probability that either of them can solve a question chosen at random? answer is 37/4

Question 935512: A can solve 75% while B can solve 70% of problems of a book.what is the probability that either of them can solve a question chosen at random?
answer is 37/40 but am unable to solve it to get this answer.would be glad if you respond to the question.thank you.
Answer by ewatrrr(24785) (Show Source): You can put this solution on YOUR website!
A can solve 75% while B can solve 70% of problems of a book.
a question chosen at random
P(either A 0r B can solve it) = 1 - P(A & B cannot solve) = 1 - = 1 - 3/40 = 37/40
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