`A, B, C, D` are any four points in the space. If `| vec(AB) xx vec(CD) + vec(BC) xx vec(AD) + vec(CA) xx vec(BD) | =

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Q 2232645532.     `A, B, C, D` are any four points in the space. If

`| vec(AB) xx vec(CD) + vec(BC) xx vec(AD) + vec(CA) xx vec(BD) | = lambda` (area of `Delta ABC)` )

then the value of `125 lambda` must be

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