Which of the following numbers are co prime numbers

- Which of the following pairs of numbers are co prime numbers
- Which of the following numbers are coprime numbers 18 and 35
- Which of the following numbers are coprime numbers 15 and 37
- Which of the following numbers are coprime numbers 17 and 68
- Which of the following numbers are coprime numbers 81 and 16
- Which of the following numbers are coprime numbers 216 and 215
- Which of the following numbers are coprime numbers 30 and 415