Question

If m[n+p(2q - 3r)] = 1, which of the variables m,n,p,q or r CANNOT be 0?

A. p
B. r
C. q
D. m
E. n

Answer 1

D. m

Explanation:

m[n+p(2q - 3r)] = 1

m cannot be zero

Replace [n+p(2q - 3r)] with some variable, call it x

m*x =1

If we let m = 0

0*x=1

This cannot happen

0 times anything = 0