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Consider the following 3 lines in space ...

Consider the following 3 lines in space `L_1: vec r= 3hat i-hat j+ 2hat k + lambda(2hat i + 4hat j-hat k) , L_2 :vec r =hat i+hat j- 3hat k + mu(4hat i + 2hat j+ 4hat k) and L_3 : vec r = 3hat i+2hat j- 2hat k + t(2hat i+hat j+ 2hat k)` Then which one of the following pair(s) are in the same plane.

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