1.
If a=i^+j^+k^\vec{a} = \hat{i} + \hat{j} + \hat{k}, b=i^+j^\vec{b} = \hat{i} + \hat{j}, c=i^\vec{c} = \hat{i} and (a×b)×c=λa+μb(\vec{a} \times \vec{b}) \times \vec{c} = \lambda\vec{a} + \mu\vec{b}, then λ+μ\lambda + \mu is equal to