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cara 2197
pertama lihat angka terdepan (2)
cari pangkat 3 yg mendekati 2197 =10
sekarang lihat yg belakan (7)
1=1(1)
2=8(8)
3=27 (7)
4=62(4)
dan seterusnya..
jadi yg belakangnya 7 = 3
jadi jwbnya 13
klw pakai pohon faktor gtw