Answer
$0.0014$
Work Step by Step
Total outcomes of getting 5 from 52: $_{52}C_5$=2598960
To get 3 cards of one denomination (4 cards )out of 52 cards (13 denominations)
n1=$_4C_3$*13=52
To get 2 cards of another denomination (4 cards )out of 49 cards (12 denominations)
n2=$_4C_2$*12=72
The probability of getting a full house is $p=\frac{52\times72}{2598960}=0.0014$
