ada sebuah buku memiliki 300 halaman berapa banyak angka 3 muncul pada buku tersebut?

3,13,23,31,32,33,34,35,36,37,38,39,43,53,63,73,83,93 = 20
maka, 20 X 3 = 60  + 1 = 61 angka 3

3,13,23,30,31,32,33,34,35,36,37,38,39,43,53,63,73,83,93,103,113,123,130,131,132,133,134,135,136,137,138,139,143,153,163,173,183,193,203,213,223,230,231,232,233,234,235,236,237,238,239,243,253,263,273,283,293,300

Hasilnya=61