Typo in Sklansky Column

Probably several readers have already pointed out this typo, but Sklansky's column in the October 11, 2002 issue of Card Player contains the following: "There are 30 children in your child's class. How many are either boys or redheads? If I tell you that there are 13 girls and four redheads, that doesn't mean the answer is 17...To get the right answer, you would in fact have to subtract the number of redheaded boys from 17." Clearly, the "13 girls" should be "13 boys." Obvious typos such as this one will not trouble the reader with a smattering of knowledge about probability. The totally unsophisticated reader, asked the question "See Why?", will drive himself crazy in a doomed attempt to see why. A published correction would be useful.