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RattanIndia logo. RattanIndia Enterprises Ltd, formerly RattanIndia Infrastructure Ltd., is an Indian company that is involved in the energy sector.. The traditional focus of the company was on coal on thermal power; however, the company has expanded its scope more recently, focusing more on emerging technologies and e-commerce.
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An alternative statement is: given n coupons, how many coupons do you expect you need to draw with replacement before having drawn each coupon at least once? The mathematical analysis of the problem reveals that the expected number of trials needed grows as Θ ( n log ( n ) ) {\displaystyle \Theta (n\log(n))} .