Question

Each of the angle between vectors $\vec{a},\vec{b}$ and $\vec{c}$ is equal to 60°. If $|\vec{a}|= 4,|\vec{b}| = 2\; and\; |\vec{c}|=6$ then the modulus of $\vec{a}+\vec{b}+\vec{c}$ is

• A. 10
• B. 15
• C. 12
• D. 20

Answer 1

Answer: (A)

10

Answer 2

The correct answer is(A): 10