यदि a, b, c, d समतलीय हैं‚ तो (a b) (c d) If a, b, c, d are coplanar, then (a b) (c d) ?

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यदि a, b, c, d समतलीय हैं‚ तो (a b) (c d) If a, b, c, d are coplanar, then (a b) (c d) ?