Simple probability PLZ help

[kuba99]

Guys please help me with those two examples, im struggling with them few hours....

 

[pka]

Do see that \(\displaystyle R_1Bl_2BU_3\) (red, black, & blue in that order) has probability \(\displaystyle \dfrac{5}{12}\dfrac{4}{11}\dfrac{3}{10}\).
How many different orders are possible? Post your answer. (The correct answer is one in the list)

 

[kuba99]

@pko thanks for help Sir! I think I did it right.

 

[pka]

@pko thanks for help Sir! I think I did it right.

@pko thanks for help Sir! I think I did it right.

Correct on both accounts.