The number of possiblities is given by the combinations of 5 blue block taken at 1
[tex]5C1[/tex]where 5C1 denotes the combinations of 5 blue block taken at 1 time. Then, we have
[tex]5C1=5[/tex]then, we will expect 5 times form the total of 12.
Similarly, for the other case (number of times = 24), we will get
[tex]2\times5C1=2\times5=10\text{ times}[/tex]that is, we will double the number of times.