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

A can solve 80% of the problems given in a book and B can solve 60%. What is the probability that, at least one of them will solve a problem selected at random from the book?

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?

One boy can solve 60% of the problem in a book and another can solve 80% . The probability that at least one of the two can solve a problem chosen at random from the book is .

One boy can solve 60% of the problem in a book and another can solve 80% . The probability that at least one of the two can solve a problem chosen at random from the book is .

A can solve 75% of the problems in this book and B can solve 70% . What is the probability that either A or B can solve a problem chosen at random ?

A can solve 75% of the problems in a book on mathematics and B can solve 70%. What is the probability that a problem chosen at random is solved?