If `a+b+c=0 and |a|=sqrt(37),|b|=3, |c|=4` then the angle between b and c is

If a+b+c=0 and |a|=5, |b|=3 and |c|=7 , then angle between a and b is

If a + b + c = 0 and |a| = 1, |b| = 1, |c| = sqrt3 ,then the angle between a and b is

Ifa,b,c are vectors such that a + b + c = 0 and | a | = 7, | b | = 5,| c | = 3, then the angle between c and b is a) pi//3 b) pi//6 c) pi//4 d) pi

If a is perpendicular to b and c, |a| = 2, |b| = 3, |c| = 4 and the angle between b and c is 2pi // 3 then [a b c] =

If a is perpedicular to b and c|a| = 2, |b| = 3 |c| = 4 and the angle between b and c is (2pi)/(3) , then [a,b,c] is equal to