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Q.

If the angle between the line 2x+1=y=z+4 and the plane 2x-y+λz+4=0 is π6, then value of λ is

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a

1357

b

4511

c

457

d

13511

answer is C.

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Detailed Solution

x+11=y2=z+42

d.r's line=(1,2,2)=(a1,b1,c1)plane 2x-y+λz+4=0  d.r's of normal (2,1,λ)sin π6=2-2+2λ1+4+14+1+λ=2λ35+λ9(5+λ)=16 λ45=7λλ=457

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