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power 4d[ Power Pattern ] Find best premutated 4D numbers based on historical trend.For eg., ABCD=24x, AACD=12x, AABB=6x, AAAB=4x, AAAA=1x Please note thatA convex lens of power 4D is kept in contact with a concave lens of power 3D, the effective power of combination will be . View Solution; Knowledge Check. A convex lens of focal length 40 cm