यदि A = {x ∈ R: x2 = x} और B = {x ∈ R: x2 - 3x + 2 = 0} है। तो B - A ज्ञात कीजिए। 

1
{1, 2}
2
{2}
3
{0, 1, 2}
4
इनमें से कोई नहीं 

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