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Let `veca` and `vecb` be unit vectors such that `|veca+vecb|=sqrt(3)`, then the value of `(2veca+5vecb)*(3veca+vecb+vecaxxvecb)=`A. `11/2`B. `13/2`C. `39/2`D. `23/2` |
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Answer» Correct Answer - C `|veca+vecb|=sqrt(3)` `implies1+1+2veca.vecb=3impliesveca.vecb=1/2` Now, `(2veca+5vecb).(3veca+vecb+vecaxxvecb)` `=6+5+17 veca.vecb=39/2` |
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