The probability that they get the math book is (2/5) 2 = 4/25.
In addition to the above two situations, the rest is that one person must have got the math book, so the probability that one of the two people will get the book is:
1-9/25-4/25= 12/25
? I only had one head teacher in senior high school for three years, and that was my math teacher, Miss Liang. Teacher Liang is a clever and capable teacher, and