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For the sequence ` a_n = 13 + (-1)^n `,
its first term is   ;
its second term is   ;
its third term is   ;
its fourth term is   ;
its 100th term is   .

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   x  x    n  |   | (   ) π DNE
   x    (   ) π DNE
( ) ( ] [ ) [ ] —∞ DNE
< > or All Real Numbers DNE
log logn ln n  | | e 
sin cos tan arcsin arccos arctan  
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