यदि A = 2x2 - 3x + 4, B = 4x2 + x - 1, तथा C = -x2 - 2x + 3 है, तो (A - B + C) में x2 तथा x के गुणांकों का गुणनफल कितना होगा?

1
-12
2
18
3
-18
4
-24

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