14. If a + b + 6 = 0, [a] = 3, [5] = 5, || = 7, then the angle between a and 6 will be -

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

If absa = 5, absb = 6 and the angle between a and b is 60^@ ,then a. b =

If a+b+c=0" and "abs(a)=3, abs(b)=5" and "abs(c)=7 then the angle between a and b is

If veca+vecb+vecc=0, |veca|=3, |vecb|=5, |vecc|=7, then angle between veca and vecb is (A) pi/6 (B) (2pi)/3 (C) (5pi)/3 (D) pi/3

If (a+3b)*(7a-5b)=0 and (a-4b)*(7a-2b)=0 . Then, the angle between a and b is

If (a+3b)*(7a-5b)=0 and (a-4b)*(7a-2b)=0 . Then, the angle between a and b is