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Question
If x = 1, y = 2 and z = 3 then (x2 + y2 + z2) = ?
Options
6
12
14
15
Solution
14
Substituting x = 1, y = 2 and z = 3 in (x2 + y2 + z2):
or, 1 + 4 + 9 = 14
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