Three balls are to be tossed in a row. How many different sequences are possible if red and blue always follow one-another in each toss ?
Choose the correct choice from the following options.
A) 2  B) 4  C) 6  D) 8  E) 10
Consider red and blue as one. But, in this arrangement they can be tossed in two different combinations.   Red first and Blue second or blue first and red second. Total we have (R and B) and third color = 2 arrangements to do. Total arrangements= 2*2= 
<gadget id="calculator">2*2</gadget>
<output>4</output>
4   4 is the answer
<result>B</result>
Three balls are to be tossed in a row. How many different sequences are possible if red and blue always follow one-another in each toss ?