Tolong kak no.3 caranya

Setelah itu di sederhanakan kak dan samakan angka yg pembagi ny ( yg bagian bawah)
Jawaban nya 4 kak

berarti

2 + (2/3) + (1/3) + (1/5) + (2/15) + (4/21) + (1/7) + (1/9) + (4/45) + (4/55)+ (2/33) =

2+ 1 + (1/3) + (1/3) + (1/5) + (132 + 110)/1815 =

3 + (2/3) + (1/5) + (242/1815) =

(11/3) + (363 + 242)/1815 =

(11/3) + (605/1815) =

(6655 + 605)/1815 =

7260/1815 =

4