Which number completes the series: 3, 7, 15, 31, ?
Which number completes the series: 3, 7, 15, 31, ?
Answer and solution
Correct answer: B) 63
Pattern: 2x + 1 (31 * 2 + 1 = 63).
Learn the method: Number Series rules and worked examples
Similar questions
- Find the next number: 20, 24, 29, 35, 42, 50, ?
- Find the next term: 17, 26, 37, 50, 65, ?
- Find the next term: 80, 99, 120, 143, 168, ?
Practise more Number Series questions in a timed mock · Report an error