Mechanical Engg. Set-1 GATE (2015)

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Multiple Choice

Directions: Carry One Mark Each.

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

  1. $\bigg[1, \frac{2}{3} \bigg]$
  2. $\bigg[\frac{-1}{2} , 1\bigg]$
  3. $\bigg[-1, \frac{1}{2} \bigg]$
  4. [2, –4]
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