The sum of ages of a father and his son is 45 years. Five years ago, the product of their ages (in years) was 124. Determine their present ages?

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Given, F+S = 45 (F-5)×(S-5) = 124 On solving , F = 36 years & S = 9 years
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Cards, marked with numbers 5 to 50, are placed in a box and mixed throughly. A card is drawn from teh box at random. Find the probability that the number on the taken out card is: (i) a prime number less than 10. (ii) a number which is a perfect square." "
The sample size is 46 (i) The prime numbers less than 10 are 5 and 7. so the probability is 2/46 or 1/23. (ii) The perfect squares are 9,16,25, 36 and 49-five in all so the probability is 5/46
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Akhil
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Which is best book for class 10th CBSE maths preparation?
See,there are hell amount of books in maths. First and foremost go for all the questions in CBSE book as well as exemplar, pay attention to all questions being taught in class and further you may purchase any book if neccessity arises.
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