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If the sum of the slopes of the lines given by 2? 2cry 7y? = Ois four times their product, then 'c' has the

If the sum of the slopes of the lines given by 2? 2cry 7y? = Ois four times their product, then 'c' has the value (A) -2 (B) -1 (C) 1 (D) 2

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