Find the next number in the series: 1, 5, 3, 10, 5, 15, ?

  1. 3
  2. 10
  3. 7
  4. 20
Answer

C) 7

Two series are mixed together. Odd positions: 1, 3, 5 (step 2); even positions: 5, 10, 15 (step 5). Next is an odd position: 5 + 2 = 7.

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