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Learning task 2: A. Determine wheter the sequence is arithmetic or not. If it is, find the common ratio and the next 3 terms

1. 99, 88, 77, 66,... 18th term___
2. ⅛, ¼, ⅜, ½,... 20th term___
3. 99, 87, 75, 63,... 12th term___​