Suatu deret a – f – b – b – f – c – c – f – d – d – … deret selanjutnya adalah?

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a – f – b – b – f – c – c – f – d – d – f – e – e – f – f – f – g – g – f – h – h – f – i – i – j – j f – k – k – f – l – l – f – m – m – f – n – n – f – o – o – f – p – p – f – q – q – f – r – r – f – s – s – f – t – t – f – u – u – f – v – v – f – w – w – f – x – x – f – y – y – f – z – z – f

#Koreksi
#Semoga membantu