KVPY Government Jobs Exams

Let a, b, x, y be real numbers such that a^2 + b^2 = 81, x^2 + y^2 = 121 and ax + by = 99. Then the set of all possible values of ay - bx is

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KVPY Other Question

The number of moles of Br2 produced when two moles of potassium permanganate are treated with excess potassium bromide in aqueous acid medium is
option
(A) 1
(B) 3
(C) 2
(D) 4 Let a, b, c, d be real numbers such that |a - b| = 2, |b - c| = 3, |c -d| = 4. Then the sum of all possible values of |a - d| is