Home  / Verbal Reasoning  / Series Completion  / Number Series
Number Series
Alphabet Series
Letter Series

What is the next number in the series: 3, 7, 15, 31, ?

Answer: A. 63
The pattern is each term is one less than double the previous term: 3*2-1=7, 7*2-1=15, 15*2-1=31, so 31*2-1=63.
Posted in:  Number Series -  Series Completion -  Verbal Reasoning