Marcus is trying to find 4 5/6-1 3/6. His work shown. What is Marcus's mistake?

Step 1: Subtract the wholes. 4-1=3

Step 2: Subtract the fractions. 5/6-3/6=2/6

Step 3: Subtract the differences. 3-2/6=2 4/6

Afootball quarterback has two more chances to throw a touchdown before his team is forced to punt the ball. he misses the receiver on the first throw 25% of the time. when his first throw is incomplete, he misses the receiver on the second throw 15% of the time. what is the probability of not throwing the ball to a receiver on either throw?