Question

Запишите все двухзначные числа меньше двадцати которые являются взаимно простыми с числом 20

Answer 1

19, 18, 17, 16, 15, 14, 13, 12, 11, 10
+10
29, 28, 27, 26, 25, 24, 23, 22, 21, 20

Answer 2

Finding Two-Digit Numbers Co-Prime to 20

To find all two-digit numbers less than 20 that are coprime to 20, we need to identify the numbers that do not share any common factors with 20 other than 1. In other words, we are looking for numbers that do not have any common divisors with 20.

The numbers that are coprime to 20 are: 3, 7, 9, 11, 13, 17, 19.

This information is supported by the concept of coprime numbers, where two numbers are coprime if their greatest common divisor (GCD) is 1.

Therefore, the two-digit numbers less than 20 that are coprime to 20 are 3, 7, 9, 11, 13, 17, and 19.

I hope this helps! If you have any other questions, feel free to ask.