यदि A = {x ∈ R: x2 -3x + 2 = 0} और B = {x ∈ R: x2 + 2x - 8 = 0} है, तो A - B ज्ञात कीजिये।

1
ϕ
2
{1, 2, -4}
3
{1, 2}
4
{1}

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