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The number of values in set of values of...

The number of values in set of values of `r` for which `^23 C_r+2.^(23)C_(r+1)+^(23)C_(r+2)geq^(25)C_(15)` is

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The number of values in set of values of r for which ""^23 C_r+2 ""^(23)C_(r+1)+ ""^(23)C_(r+2)ge ""^(25)C_(15) is

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The number of values of 'r' satisfying the equation ""^(39)C_(3r-1)- ""^(39)C_(r^(2) )= ""^(39)C_(r^(2)-1) - ""^(39)C_(3r) is

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