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Complete the series: 4, 8, 9, 13, 14, 18, _____?

Complete the series: 4, 8, 9, 13, 14, 18, _____?

Explanation
  • The pattern alternates between +4 and +1:
    • 4 + 4 = 8
    • 8 + 1 = 9
    • 9 + 4 = 13
    • 13 + 1 = 14
    • 14 + 4 = 18
    • 18 + 1 = 19
  • The missing number is 19.