If \( 2 \lambda \) is the number of ways of selecting 3 member subset of \( \{1,2,3, \ldots, 29\...

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If \( 2 \lambda \) is the number of ways of selecting 3 member subset of \( \{1,2,3, \ldots, 29\} \), so that the numbers form of a GP with integer common ratio, then the value of \( \lambda \) is
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