Discussion
Letters and numbers alternate below. Decide which kind of term comes next, then give it.
P, 3, Q, 6, R, ?
Answer: C
Correct answer: 9
Letters and numbers alternate. The letters run P, Q, R, advancing by one, and the numbers run 3, 6, increasing by three. The next term is a number, and three beyond 6 is 9. The position in the series decides which strand supplies the answer, so it is worth numbering the terms before deciding. S is the next letter and is chosen by anyone who reads the letters as the main series. Mixed letter and number series are a warning to number the terms before answering, since the answer's type depends entirely on whether its position is odd or even.
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