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If hat x,hat y,hat z are mutually perpe...

If `hat x,hat y,hat z` are mutually perpendicular unit vectors and `a hat x+a hat y+c hat z,hat x+hat z` and `c hat x+c hat y+b hat z` are coplanar, then (A) a,b,c are in AP (B) a,b,c are in GP (C) a,b,c are in HP (D) a,c,b are in GP

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