यदि \(\vec a + 2\vec b + 3\vec c = \vec 0\)और \(\vec a \times \vec b + \vec b \times \vec c + \vec c \times \vec a = \lambda \left( {\vec b \times \overrightarrow {c\;} } \right),\) है, तो λ का मान क्या है?

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