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Number of triplets of a, b & c for which...

Number of triplets of a, b & c for which the system of equations, `ax - by = 2a - b and (c +1)x+cy = 10-a + 3 b ` has infinitely many solutions and `x = 1. y = 3` is one of the solutions, is: (A) exactly one (B) exactly two (C) exactly three (D) infinitely many

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