Question

Let vector a r and b be two vectors such that vector |2a+3b| |3a+b| and the angle between a and b is 60° . If 1/8 vector a is a unit vector, then vector |b| is equal to :

(1) 4

(2) 6

(3) 5

(4) 8

Answer 1

Correct answer is: (3) 5