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If the planes vecr.(hati+hatj+hatk)=q(1)...

If the planes `vecr.(hati+hatj+hatk)=q_(1),vecr.(hati+2ahatj+hatk)=q_(2)andvecr.(ahati+a^(2)hatj+hatk)=q_(3)` intersect in a line, then the value of `a` is

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