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If bar(a),bar(b),bar(c) are non -zero,no...

If `bar(a)`,`bar(b)`,`bar(c)` are non -zero,non - coplanar vectors and `bar(a)+bar(b)+bar(c)`,`-a+8bar(b)+7bar(c)`,`5bar(a)+lambdabar(b)-3bar(c)` are coplanar,then the value of `|lambda|` is

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