Find the missing number? 2, 3, 4, 6, 6, 9, 8, _________, 10
2023
Find the missing number?
2, 3, 4, 6, 6, 9, 8, _________, 10
- A.
10
- B.
8
- C.
12
- D.
15
Attempted by 158 students.
Show answer & explanation
Correct answer: C
Key insight: the sequence interleaves two simple sequences.
Odd positions (1, 3, 5, 7, 9): 2, 4, 6, 8, 10 — multiples of 2.
Even positions (2, 4, 6, 8): 3, 6, 9, 12 — multiples of 3.
Therefore the missing number at position 8 is 12.