GATE Mechanical Engineering (ME) 2015 Shift 1 Solved Paper

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Question : 9 of 65

Marks: +1, -0

If a² + b² + c² = 1 then ab + bc + ac lies in the interval

$[\;{1,2}/{3}]$
$[\;{−1}/{2},1]$
$[−1,\;{1}/{2}]$
[2, -4]

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