kurban

numara abcdefg olsun

([([abc * 80] + 1 ) * 250 ] + 2 * defg - 250) /2

([(abc * 10 * 8 + 1 ) * 25 * 10 ] + 2 * defg - 250) /2

şeklinde 80 ve 250 yi çarpanlarina ayirin

([abc * 10 * 8 * 25 * 10 + 25 * 10 ] + 2 * defg - 250) /2

sonra sayilari asagidaki gibi düzenleyin

([abc * 10000 * 2 + 250] + 2 *defg - 250 ) / 2

([abc0000 * 2 + 250 ] +2 *defg - 250 ) / 2

(abc0000 * 2 + 250 + 2 * defg -250 ) / 2

250 ler sadelesir

(abc0000 * 2 + 2 * defg) /2

2 parantezine alirsak

2* (abc0000 + defg) /2

abc0000 + defg = abcdefg

yani yine ayni sayi!