There are 15 boys and 10 girls in a class. If three students are selected at random , what is the probability that 1 girl and 2 boys are selected?

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The sum of the digits of two -digit number is 10, while when the digits are reversed , the number decrease by 54. Find the changed number .

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If Tk. 5,000 is invested at 12% annual rate of interest, how much will the investment be worth after 2 years?

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A shopkeeper earns a profit of 12% on selling a book at 10% discount on the printed price. The ratio of the cost price and the printed price of the book is -

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The selling price of an article after giving two successive discounts of 10% and 5% on the marked price is TK. 171 . What is the marked price ?

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