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If all of the telephone extensions in a certain company must be even numbers, and if each of the extensions is formed using the digits 1,…

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In the manufacture of a certain product, 5 percent of the units produced are defective and 4 percent of the defective units are shipped for…

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A certain college has a student-to-teacher ratio of 11 : 1. The average (arithmetic mean) annual salary for teachers is Rs.26000. If the…

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A takes 2 hours to make a publication. B takes 10 hours to make a publication. Find the time taken by them to make two publications,…

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