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What's the total number of different ways that the blank space below can be filled in so that the resulting 4 digit number is a multiple of 11

A conducting spherical shell having inner radius a and outer radius b carries a net charge q. If a point charge q is placed at the centre of this shell, then the surface charge density on the outer surface of the shell is 1) (3q)/(4pi * b ^ 2) 2) q/(4pi * b ^ 2) 4) Zero 3) 2q 4pi * b ^ 2

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