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If 2lamda is the number of ways of selec...

If `2lamda` is the number of ways of selecting 3 member subset of {1,2,3, . .,29}, so that the number form of a GP with integer common ration, then the value of `lamda` is

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If 2lamda is the number of ways of selecting 3 member subset of {1,2,3, . .,29}, so that the number form of a GP with integer common ratio, then find the value of lamda

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