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UPSC CDS 2 2023 Math Paper

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Question : 22

Total: 100

If (3a + 6b + c + 2d) × (3a - 6b - c + 2d) = (3a - 6b + c - 2d) × (3a + 6b - c - 2d), then which one of the following is correct?

ab = cd
ac = bd
ad = bc
ad + bc = 0

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