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One term in the series is wrong. Find it: 6, 12, 21, 33, 47, 66

Competition practiceNumber Series
  • A33
  • B47
  • C21
  • D66

Step-by-Step Solution

Differences should rise by 3 (6, 9, 12, 15, 18), so after 33 the term is 33 + 15 = 48, not 47.
Answer: B) 47

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