Question

A box contains 13 orange blocks, 19 yellow blocks, and 8 purple blocks. Paul randomly chose a block, then he randomly chose another block without replacing the first block. What is the probability that he chose 2 orange blocks? Write your answer as a decimal.

Answer 1

first pick: 13/(13+19+8)=13/40
the second pick: 12/39
both: 13/40 *12/39=156/1560=0.1