21 point\ Let

x_(i)=1

if Project

i

is selected,

i=1,2,3,4,5

; and 0 otherwise:\ Which answer below indicates that if Project 2 is selected, then Project 4 should be selected?\

x_(2)+x_(4)

\

x_(2)

\ None of the answers is correct.\

x_(2)+x_(4)=1

\

x_(4)

Let xi=1 if Project i is selected, i=1,2,3,4,5; and 0 otherwise: Which answer below indicates that if Project 2 is selected, then Project 4 should be selected? x2+x41x2x4 None of the answers is correct. x2+x4=1x4x2