If x, y and z are real numbers such that (x - 4)2 + (y - 5)2 + (z - 6)2 = 0 then (x + y + z) is equal to

If x, y and z are real numbers such that (x - 4)² + (y - 5)² + (z - 6)² = 0 then (x + y + z) is equal to
1). -15
2). 3
3). 7
4). 15

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