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Two simple patterns are woven together in this list. Find the next term: 4, 9, 8, 13, 12, 17, 16, ?

Competition practiceReasoning & Mental Ability
  • A20
  • B22
  • C21
  • D19

Step-by-Step Solution

Read the terms in the odd places (1st, 3rd, 5th, 7th): 4, 8, 12, 16 — they go up by 4. Read the terms in the even places (2nd, 4th, 6th): 9, 13, 17 — they also go up by 4. The missing term is in the 8th place, which is an even place, so it follows 17: 17 + 4 = 21.
Answer: C) 21

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