A football quarterback has 2 more chances to throw a touchdown. He misses the receiver on the first 30% of the time. When his first throw is incomplete, he misses the receiver on the second throw 10%

A football quarterback has 2 more chances to throw a touchdown. He misses the receiver on the first 30% of the time. When his first throw is incomplete, he misses the receiver on the second throw 10% of the time. What is the probability of not throwing the ball to a receiver on either throw? please explain.