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     EduGorilla 
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    The equation of the sphere concentric with the sphere 2x2 + 2y2 + 2z2 – 6x + 2y – 4z = 1 and double its radius is

    Options :-

    1. x2 + y2 + z2 - x + y - z = 1

    2. x2 + y2 + z2 - 6x + 2y - 4z = 1

    3. 2x2 + y2 + z2 - 6x + 2y - 4z - 15 = 0

    4. 2x2 + 2y2 + 2z2 - 6x + 2y - 4z - 25 = 0

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