" 13."sqrt(3^(n))=729*vec " st "" at "n=?

If sqrt(3^(n))=729, then the value of n is (a)6(b)8(c)10(d)12

If (3)^(n)=729 , then n is equal to ……………..

If vec a , vec b ,a n d vec c are such that [ vec a vec b vec c]=1, vec c=lambda vec axx vec b , angle, between vec aa n d vec b is (2pi)/3,| vec a|=sqrt(2),| vec b|=sqrt(3)a n d| vec c|=1/(sqrt(3)) , then the angel between vec aa n d vec b is pi/6 b. pi/4 c. pi/3 d. pi/2

If vec a , vec b ,a n d vec c are such that [ vec a vec b vec c]=1, vec c=lambda vec axx vec b , angle, between vec aa n d vec b is (2pi)/3,| vec a|=sqrt(2),| vec b|=sqrt(3)a n d| vec c|=1/(sqrt(3)) , then the angel between vec aa n d vec b is a. pi/6 b. pi/4 c. pi/3 d. pi/2

If | vec a | = sqrt (26), | vec b | = sqrt (7) and | vec a xxvec b | = 13 then vec a.vec b =

If vec a , vec b ,a n d vec c are such that [ vec a vec b vec c]=1, vec c=lambda vec axx vec b , , | vec a|=sqrt(2),| vec b|=sqrt(3)a n d| vec c|=1/(sqrt(3)) , then the angle between vec a and vec b is pi/6 b. pi/4 c. pi/3 d. pi/2

lim_ (n rarr oo) (3) / (n) [1 + sqrt ((n) / (n + 3)) + sqrt ((n) / (n + 6)) + sqrt ((n) / (n +9)) + ...... + sqrt ((n) / (n + 3 (n-1)))

Let vec r be a unit vector satisfying vec rxx vec a= vec b ,w h e r e| vec a|=sqrt3a n d| vec b|=sqrt2. Then vec r =?