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Which number does not fit the series 6, 12, 21, 33, 49, 66?

Competition practiceNumber Series
  • A21
  • B49
  • C33
  • D66

Step-by-Step Solution

Differences should be +6, +9, +12, +15, +18, giving 6, 12, 21, 33, 48, 66; so 49 should be 48.
Answer: B) 49

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