A can solve 90% of the problems given in...

A can solve 90% of the problems given in a book and B can solve only 70% problems. What is the probability that at least one of them will solve the problem selected at random from the book?

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MODERN PUBLICATION-PROBABILITY-EXERCISE

A husband and his wife appear for an interview for two parts. The prob...
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A husband and his wife appear for an interview for two parts. The prob...
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In a lot of 12 microwave ovens, there are 3 defective units. A person ...
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A card from a pack of 52 cards is lost. From the remaining cards of th...
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A card from a pack of 52 playing cards is lost. From the remaining car...
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A man is known to speak the truth 3 out of 4 times. He throws a die an...
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Two bags contain : 4 red and 4 black. 2 red and 6 black balls One ball...
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Two bags contain 6 red and 3 black, 5 red and 5 black balls. One ball ...
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Two bags contain 6 red and 4 black, 3 red and 3 black balls. One ball ...
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Bag I contains 3 red and 4 black balls while another Bag II contains 5...
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There are two bags I and II . Bag I contains 4 white and 3 red balls a...
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A bag contains 4 red and 4 black balls, another bag contains 2 red and...
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Bag I contains 3 red and 4 black balls, Bag II contains 5 red and 6 bl...
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Bag I contains 5 red and 7 white balls and bag 11 contains 4 red and 8...
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Give three identical boxes I , II and III, each containing two coins. ...
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In a tape recorder factory, three machines A, B and C produced 50%, 30...
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A motorcycle manufacturing company has two plants A and B. Plant A pro...
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