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One number does not fit the pattern 2, 3, 5, 8, 13, 20, 34. Which one is it?

Competition practiceNumber Series
  • A20
  • B8
  • C13
  • D34

Step-by-Step Solution

Each term is the sum of the two before it, so after 8 and 13 comes 21; the term 20 should be 21.
Answer: A) 20

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