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= 100000000......0000000 - 25
sebanyak 50 suku
=99999999.......9999975
sebanyak 47 suku
jumlah digit = 47 . 9 + 7 +5
= 423 + 12
= 435
b)
= 10000000.......00000 - 76
sebanyak 56 suku
= 9999999999.....9999924
sebanyak 53 suku
jumlah digit = 53.9 + 2 + 4
= 477 + 6
= 483