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If vec P = (a+1) hati + a hatj + a hatk ...

If `vec P = (a+1) hati + a hatj + a hatk` ` vec Q = a hati + (a+1) hatj + ahatk` `vec R = a hati + a hatj + (a+1) hatk` ` vec P, vec Q, vec R` are coplanar vectors and `3(vec P . vec Q)^2 - lambda | vec R xx vec Q|^2 = 0` then value of `lambda` is

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