Elitmus Exam Numerical Ability Arithmetic

w^2+x^2)x(y^2+z^2) is always divisible by which of the max no. Where w;x;y;z are odd integers?
Option 20;8;4;2

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Elitmus Other Question

Find the values of n for which n+18 and n+90 is a perfect square? ? find the sum of series 2/5+2/5^2+2/5^3+2/5^4-------------infinite?