Tough and Tricky questions: Combinations.
Four students - 2 boys and 2 girls - are to sit side by side for a makeup exam. How many ways could they arrange themselves given that no two boys and no two girls can sit next to one another?  Choose the correct choice from the following answers.
A) 8  B) 36  C) 72  D) 240  E) 720
We can have 2 arrangements:   BGBG or GBGB   2!*2!*2 = 2*2*2= 
<gadget id="calculator">2*2*2</gadget>
<output>8</output>
8 ways.   Ans. 8) 8
<result>A</result>
Tough and Tricky questions: Combinations.
Four students - 2 boys and 2 girls - are to sit side by side for a makeup exam. How many ways could they arrange themselves given that no two boys and no two girls can sit next to one another?