Which string would match the pattern 1#3?

Which string would match the pattern 1#3?

• A. 915
• B. 102
• C. 203
• D. 103

Answer: (D)

Pattern with a wildcard uses # to stand for any single digit. So 1#3 means a three-digit string where the first digit is 1, the last digit is 3, and the middle digit can be any digit. Check each option: 915 doesn’t start with 1. 102 ends with 2, not 3. 203 starts with 2, not 1. 103 starts with 1 and ends with 3, with the middle digit allowed to be anything, which fits perfectly. So the matching string is 103.

Pattern with a wildcard uses # to stand for any single digit. So 1#3 means a three-digit string where the first digit is 1, the last digit is 3, and the middle digit can be any digit. Check each option: 915 doesn’t start with 1. 102 ends with 2, not 3. 203 starts with 2, not 1. 103 starts with 1 and ends with 3, with the middle digit allowed to be anything, which fits perfectly. So the matching string is 103.