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If vec a=2x^2 hat i+4x hat j+ hat ka n ...

If ` vec a=2x^2 hat i+4x hat j+ hat ka n d vec b=7 hat i-2 hat j+x hat k` are inclined at an obtuse angle and `a` is parallel to ` vec c= hat i+20 hat j+50 hat k` then `x=1/(10)` 2. `x=1` 3. `x=-1/(40)` 4. `x=1/2` 5. No such value of `x` exist

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RESONANCE DPP ENGLISH-JEE MAINS-All Questions
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