Mathematics

Problem

Given the points A(-2, 3, -4), B(3, 2, 5), C(1, -1, 2) & D(3, 2, -4). The projection of the vector

\vec{AB}

on the vector

\vec{CD}

is - (A)

\frac{22}{3}

(B)

-\frac{21}{4}

(C)

-\frac{47}{7}

(D) -47