If the mean of a,b,c is M and ab + bc + ca = 0, then the mean of a2, b2, c2 is
M2
3M2
6M2
2M2
9M2
0, 2, 8, 14, ?, 34
1, 4, 2, 8, 6, 24, 22, 88, ?
1, 4, 9, 16, 25, ?
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