Ms. pacheco mr. edwards and mr. richards are three math teachers at tanner and middle school ms pacheco is three years older than mr. richards mr. edwards is twice as old as mr. richards the sum of mr. richards and mrs. edwards age is 81 how old is each person

Mariah is randomly choosing three books to read from the following: 5 mysteries, 7 biographies, and 8 science fiction novels. which of these statements are true? check all that apply. there are 20c3 possible ways to choose three books to read. there are 5c3 possible ways to choose three mysteries to read. there are 15c3 possible ways to choose three books that are not all mysteries. the probability that mariah will choose 3 mysteries can be expressed as . the probability that mariah will not choose all mysteries can be expressed as 1 −