Gate Exam Numerical Ability Averages

If a2 + b2 + c2 = 1, then ab + bc + ac lies in the interval
(a)  
 
1,2
3 (b)
− 
 
1 ,1
2
(c)
−   − 
1, 1
2 (d) [2, – 4]

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