M4maths Maths Puzzle Numerical Ability Number System

QN:-n^1/2=41
a) 83 b)81 c)2 d)1

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M4maths Other Question

If a square of "x meter" is cut so that to make it an octagon,give a relation to find the length of the side of octagonal(in formulating way). what value of cot2xcotx - cot3xcot2x -cot3xcotx is