If 1998=p^sq^tr^u, where p,q and r are prime numbers, what is the value of p+q+r?
Answer Choices
A. 222
B. 48
C. 42
D. 66
E. 122
If 1998=p^sq^tr^u, where p,q and r are prime numbers, what is the value of p+q+r?
Answer Choices
A. 222
B. 48
C. 42
D. 66
E. 122