On a certain number line, conditions are a<b<c<d<0 and abcd>0. Which of the following must be true?
I ab>0 II cd>0 III de>0
Choose the correct answer:
A) I &II only	B) II only	C) III only	D) I only	E) II and III only
Givena<b<c<d abcd="" and="">0.   Suppose, for the product to be greater than 0, we can two variables as -ve or four variables can be -ve.   We are given : I ab&gt;0 II cd&gt;0 III de&gt;0   case 1: a and b can be negative/positive and if they are... we get greater than 0.   case 2: we have cd , then c and d both can be negative/positive and if they are... we get greater than 0.   ab &gt; 0 , cd &gt; 0   So cases 1 and 2 are fine.   I &amp;II only</b<c<d>
<result>A</result>
On a certain number line, conditions are a<b<c<d<0 and abcd>0. Which of the following must be true?
I ab>0 II cd>0 III de>0