Each face of a cube is painted either white or black. In how many ways can a cube be painted?
8
10
11
16
12
Number of ways in which four faces can be painted = 24 => 16
0, 2, 8, 14, ?, 34
1, 4, 2, 8, 6, 24, 22, 88, ?
1, 4, 9, 16, 25, ?
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