1275 Вправа 1275Алгебра 8 клас Бевз 2025 · § 26 · стор. 248

1275. How many two-digit numbers can be formed from the digits 5, 6, 7, 8, 9 if the digits in the number can be repeated? Build a tree of possible options.

Tens digit: 5 options; units digit: 5 options (digits can repeat):

${\displaystyle 5\cdot 5=}$${\displaystyle 25}$ numbers.

Відповідь: 25.