Answer :

Aidenlink123
There are 26 terms in this arithmetic sequence. They are all subtracted by 4.
the common difference = 1 -5 = -4

nth term  = 5 +(n-1)*-4 
last term = -99 :-
-99 = 5 -4n + 4 
-99 = 9 - 4n
4n =  108
n = 27

there are 27 terms in this series

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