Answer: A
Step-by-step explanation:
the probability of the first book being science is (science books/total books)
there are 3 science books and 7 + 3 = 10 total books
so the probability the first time is 3/10
if you pick a science book the first time and don't replace it, the number of science books drops to 2, and the total books drops to 9
so the probability the second time is 2/9
now multiply these two values to find the probability of both being science books
3/10 x 2/9
= 6/90
= 1/15
