Question

If rstv=1 and stuv= 0 which of the following must be true?
A. r<1
B. s<1
C. t<1/2
D. u=0
E. v=0
I don't know what steps I should use to solve this problem.

Answer 1

The only way for stuv to be zero if if one or more of the factors are zero. Considering rstv=1, then r, s, t, v cannot be zero, so therefore, u has to be zero.

check my thinking.