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Kelas 8 MatematikaBab Barisan dan Deret Bilangan
Jumlah bilangan asli berurutan = 1/2 . n . (n + 1)
Jumlah seluruh halaman sebelum disobek (60 halaman)
= 1/2 . 60 . (60 + 1)
= 30 . 61
= 1.830
Jumlah halaman setelah disobek = 1.780
Selisih = 1.830 - 1.780
Selisih = 50
2 halaman disobek, maka terdapat 4 nomor.
a + a + 1 + a + 2 + a + 3 = 50
4a = 50 - 6
a = 44/4
a = 11
11, 12, 13, 14
Maka, halaman terkecil = 11