1.

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`

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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