Find the number of ways you can fill a 3 x 3 grid (with 4 corners defined as a,

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Find the number of ways you can fill a 3 x 3 grid (with 4 corners defined as a, b, c, d), if you have 3 white marbles and 6 black marbles.

Options:

A . 75

B . 84

C . 80

D . None of these

Answer: Option B

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