Answer:

Step-by-step explanation:
Given that,
Vector
............(1)
We need to find the magnitude of vector A. Let us suppose vector in the form of, R = xi + yj + zk. Its magnitude is given by :

In equation (1),
x = 1
y = -2
z = 3
So, the magnitude of vector A is given by :

|A| = 3.74
So, the magnitude of given vector is 3.74. Hence, this is the required solution.