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Let A={x|x^2 + (m - 1)x -2(m +1)=0, x in...

Let `A={x|x^2 + (m - 1)x -2(m +1)=0, x in R}, {B = {x|(m-1)x^2 + mx + 1 = 0, x in R}` Number of values of m such that `AuuB` has exactly 3 distinct elements, is

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