<PRE><B>Question 373286</B>
&lt;br&gt;&lt;font face=&quot;Tahoma&quot;&gt;Since all probabilities must sum to 1, &lt;br&gt;

we can easily see that since the probability of having a pure white guinea pig is 0.25&lt;br&gt;

the probability of NOT having a pure white guinea pig is 1-0.25 or 0.75&lt;br&gt;

This is also known as finding the complement of an event.&lt;br&gt;

The event is a pure white offspring with p=0.25&lt;br&gt;

The complement of that event is NOT having a pure white offspring with p=0.75&lt;br&gt;

I hope this helps!&lt;br&gt;</PRE>