Các số Không bao gồm 2 là: 12 , 22 , 32 ,...,92
Từ 10 đến 99 có:
(99 - 10) : 1 + 1 = 90 (số)
Từ 12 đến 92 có:
(92 - 12) : 10 + 1 = 9 (số)
Vậy có tất cả:
90 - 9 = 81 (số)
How many 2-digit numbers do not include digit 0
How many 2-digit numbers do not include digit 0 ?
the sum of 2 - digit numbers do not include digit 3
The sum of 2- digit numbers do not include digit 3.
the sum of 2- digit numbers do not include digit 3 . Giai nhanh len nhe . Mai em phai dem nop roi
how many two-digit numbers are there in which the tens digit is greater than the ones digit?
How many four -digit -numbers have 1 as their second digit and 5 as their last digit ?
how many 2-digit even numbers are there ?
Choose 3 digits from 8, 6, 0, 5, 2 and 1 to form 3-digit numbers. How many odd numbers
are there? (The repetition of digits is not allowed)giúp me với
