self Maths Puzzle

Among the number square root 2, cube root 9, fourth root 16, fifth root 32, the greatest one is :

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self Other Question

The sum of a pair of positive integers is 336 and the H.C.F. is 21. The number of such possible pairs is : The sum of the numerator and denominator of a positive fraction is 11. If 2 is added to both numerator and denominator, the fraction is increased by 1/24. The diffrence of numerator and denominator of the fraction is :