Q 2262456335.     If angle between `hat(i)` and line of intersection of the
planes

`vec(r) * ( hat(i) +2 hat(j) +3 hat(k) ) =0` and

`vec(r) * ( 3hat(i) +3 hat(j) + hat(k) =0` is

`cos^(-1) (21/sqrt (lambda ))`, then the

value of `lambda` must be

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