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JEE Advanced Model Paper 13 with solutions for online practice

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Question : 42 of 60
 
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Two distinct numbers are chosen at random from the set {1,2,3,......3n}. Theprobability that x2−y2 divisible by 3 is
pn+q
r(3n−1)
 then p + q + r = ..... where G.C.D (p , q) = G.C.D (q , r) = G.C.D (r , p) = 1
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