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Karena dicari kelereng awal perhitungannya dibalik, jika kalah justru ditambah kalau menang dikurang21-20+12-6=1+12-6=13-6=7
21 - 14 = 7 butir.
Jadi kelereng g alih mula2 cuma ada 7 butir.
Maaf jika salah