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     EduGorilla 
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    A piece of cylindrical pipe of 18 cm length and 6 cm thickness has a total surface area of 2112 cm2. Find its external and internal radius. (π =22/7)

    Options :-

    1. 8 cm, 2 cm
    2. 10 cm, 4 cm
    3. 13 cm, 9 cm
    4. 11 cm, 5 cm
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