## Elementary Statistics: A Step-by-Step Approach with Formula Card 9th Edition

$0.363$
Number of choices of selecting 3 out of 8 science books: $_8C_3$=56 Number of choices of selecting 4 out of 9 math books: $_9C_4$=126 Total choices of selecting 7 books out of 17: $_{17}C_7$=19448 The probability for this problem $p=56\times126/19448=0.363$