12. 
In the following question, a letter series is given. Some of the letters of the series are missing. This missing letters are given in same order as one of the four/five alternatives below the series. Find out the correct alternative. adb__ac__da__cddcb__dbc__cbda 


17. 
In the following question, a letter series is given. Some of the letters of the series are missing. This missing letters are given in same order as one of the four/five alternatives below the series. Find out the correct alternative. ab__d__ __b__dm__ __x__ __ 


18. 
In the following question, a letter series is given. Some of the letters of the series are missing. This missing letters are given in same order as one of the four/five alternatives below the series. Find out the correct alternative. __ __r__ttp__ __s__ tp__ __ __s__ __ __ 


19. 
In the following question, a letter series is given. Some of the letters of the series are missing. This missing letters are given in same order as one of the four/five alternatives below the series. Find out the correct alternative. a__b__c a__b__c__a__c c 


20. 
In the following question, a letter series is given. Some of the letters of the series are missing. This missing letters are given in same order as one of the four/five alternatives below the series. Find out the correct alternative. abc__ya bc__xw abc dev__ 

