Ten Little Monkeys Were Jumping on a Bed

Essay

Ten little monkeys were jumping on a bed. There is a 35% chance that one will fall off and bump his head. In the bedroom
next door, five kangaroos were jumping on a bed. Being more adept at jumping, there is only a 20% that a kangaroo will fall
off the bed.
-What are the chances that if the monkeys jump every day for a week that at least one will
fall off of the bed?