Explanation:-
                                        
											                    	
Solution: 
                      		The given sequence is a combination of two series:
I: 1st , 3rd, 5th, 7th, 9th, 11th terms i.e., A, B, C, D, E, ?
II: 2nd, 4th, 6th, 8th, 10th terms i.e., B, D, F, H, ?
Clearly , I:  consists of consecutive letters while II:  consists of alternate letters. 
So, the missing letter in I is F, while that in II is J.
So, the missing terms i.e., 10th and 11th terms re J and F respectively.                     
                    
                                    
 
                            
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