SOLUTION: What is the missing number in the sequence below? 4,7,12,21, (), 71

Algebra ->  Sequences-and-series -> SOLUTION: What is the missing number in the sequence below? 4,7,12,21, (), 71      Log On


   

Question 927486: What is the missing number in the sequence below?
4,7,12,21, (), 71
Answer by srinivas.g(540) About Me  (Show Source):
You can put this solution on YOUR website!
ANswer is 38
4*2-1 =7
7*2-2 =12
12*2-3=21
21*2-4=38
38*2-5=71
so result : 38