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There is a group of persons each of whom is capable to complete a piece of work in 16 days, when working individually. On the first day one person works, on the second day another person joins him, on the third day one more person joins them and this process continues till the work is completed. How many days are needed to complete the work?

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There is a group of persons each of whom is capable to complete a piece of work in 16 days, when working individually. On the first day one person works, on the second day another person joins him, on the third day one more person joins them and this process continues till the work is completed. How many days are needed to complete the work?






 
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