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P (3,1) Q (6,5) R (x,y) are three points such that angle PRQ is a right angle and area of triangle PRQ is 7.. number of such points R that are possible is ???? options 1 2 3 4

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how to buy 20kg of items in 20 rs if 1 kg of onion cost 20 rs, 1kg of tomato cost 1 rs, 1 kg of rice cost 0.25 rs. 788$-89$=55% $= ????????