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If vec a=a1 hat i+a2 hat j+a3 hat k ; ...

If ` vec a=a_1 hat i+a_2 hat j+a_3 hat k ; vec b=b_1 hat i+b_2 hat j+b_3 hat k , . vec c=c_1 hat i+c_2 hat j+c_3 hat k ` and `[3 vec a+ vec b` `"""` ` 3 vec b+ vec c` `""""` `3 vec c+ vec a]=lambda[vec a vec b vec c]` , then find the value of `lambda/4` .

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