Question 1196897
<font color=black size=3>
Answer: 7



-----------------------------------------------------
Reasoning:


Let,
B = blue
R = red
Y = yellow


The given data set is 
B,RRRR,YYY
the task is to select three of these to see how many color combos we can form.


The seven different color combos are:<ol><li>BRR</li><li>BRY</li><li>BYY</li><li>RRY</li><li>RYY</li><li>RRR</li><li>YYY</li></ol>Here's the process I did:
Start with B which is toward the beginning of the alphabet compared to R and Y. There's only one ball of this color so we can't select another B.
Then select the next highest letter R, followed by another R
That forms BRR meaning a blue ball, red, and then another red is selected. 
The order doesn't matter due to the word "combinations" (in contrast to permutations where order does matter)


Then place the balls back. 
Select B again, then R, then Y this time
That forms BRY which is the second item on the list.
The idea is to sequentially scroll through the terms alphabetically until fully exhausting the list of all seven possibilities.
</font>