Find the next number in the series: 3, 10, 5, 15, 7, 20, ?

Answer and explanation

Correct answer: D. 9

  1. Step 1: The series is two interleaved patterns: 3, 5, 7 and 10, 15, 20.
  2. Step 2: The next term continues the first pattern by adding 2: 9.
Answer
9.

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