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The curved surface area of a cylinder is 2π (y2 – 7y + 12) and its radius is (y – 3). Find the height of the cylinder (C.S.A. of cylinder = 2πrh).

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Curved surface Area = 2π (y2 – 7y + 12)

Radius = y  - 3

C.S.A. = 2πrh

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