Aptitude:: Numbers

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11 

... up to n terms = ?

A. B.
C. D. None of these

12 

A. 144 B. 864
C. 2 D. 4
E. None of these    

13 

A. B.
C. D.
E. None of these    

14 

A. 1449 B. 497
C. 2 D. 4
E. None of these    

15 

Which one of the following is the common factor of and ?

A. (47 - 43) B. (47 + 43)
C. D. None of these

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