ANSWER:
0.00001847
STEP-BY-STEP EXPLANATION:
A hand consists of 5 cards from a well shuffled deck of 5 cards.
Which means that there is a total number of outcomes = 52C5
[tex]\begin{gathered} _{52}C_5=\frac{52!}{5!\cdot47!} \\ \\ _{52}C_5=2598960 \end{gathered}[/tex]
Since we get 4 fives, number of favorable outcomes of a it would be 48 (52 - 4)
Therefore, the required probability is:
[tex]\begin{gathered} p=\frac{\text{ number of favorable outcomes}}{\text{ total number of outcomes }} \\ \\ \text{ we replacing:} \\ \\ p=\frac{48}{2598960}=0.00001846892\cong0.00001847 \end{gathered}[/tex]
The probability of being dealt four fives is 0.00001847