Find the missing number in the sequence: 23, 34, 47, ?
2017
Find the missing number in the sequence: 23, 34, 47, ?
- A.
72
- B.
65
- C.
69
- D.
62
Attempted by 105 students.
Show answer & explanation
Correct answer: D
Key idea: Treat the numbers as a sequence and compare consecutive differences.
34 − 23 = 11
47 − 34 = 13
The differences are increasing odd numbers: 11, 13, 15, ...
Next number = 47 + 15 = 62.
Therefore, the correct answer is 62.