4, 5, 7, 12, 37, 157

Direction: Find out the wrong number in the following number series.                                    

Q. 4, 5, 7, 12, 37, 157

A.157                                                    

B.12                                                      

C.7                                                         

D.4                                                        

E. None of these

Sol:

4 + 1! = 5

5 + 2! = 7

7 + 3! = 13

13 + 4! = 37

37 + 5! = 157