Q.

Let the shortest distance between the lines  L:x52=yλ0=z+λ1,       λ0   and  L1:x+1=y1=4z​​​​​​​​​​​​​​​​           be   36       If    (α,β,γ)  lies on L then which of the following is Not possible?

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a

2α+γ=4

b

α2γ=5

c

2αγ=5

d

α+2γ=20

answer is B.

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Detailed Solution

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r1=(5,λ,λ)+t(2,0,1)=a¯+tb¯            r2=(1,1,4)+s(1,1,1)=c¯+sd¯             b¯×d¯=iJ2k          a¯c¯=6i+(1λ)J+(4+λ)k¯          S.D=|(a¯c¯),(b¯×d¯)|b¯×d¯||=36               λ=15               α=2t+5,    β=15,    γ=t15                  α+2γ=25             2α+γ=4t+10+t15=3t5           =5t+25

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