Testing text contrast

Which of the examples below has colour contrast that passes Success Criterion 1.4.3: Contrast (Minimum).

Normal text smaller than 24px must be at least 4.5:1.
Normal text 24px or larger must be at least 3:1.
Bold text smaller than 18px must be at least 4.5:1.
Bold text 18px or larger must be at least 3:1.

Example 1

Normal text smaller than 24px should be at least 4.5:1.
This text is 20px.
Does this colour contrast pass?

Foreground: #777
Background: #fff
Colour contrast: 4.48:1
Result: this is less than 4.5:1, so it fails

Example 2

Normal text 24px or larger should be at least 3:1.
This text is 26px.
Does this colour contrast pass?

Foreground: #3EA83F
Background: #fff
Colour contrast: 3.05:1
Result: this is more than 3:1, so it passes

Example 3

Bold text smaller than 18px should be at least 4.5:1.
This text is 17px.
Does this colour contrast pass?

Foreground: #DB8F00
Background: #fff
Colour contrast: 2.64:1
Result: this is less than 4.5:1, so it fails

Example 4

Bold text 18px or larger should be at least 3:1.
This text is 24px.
Does this colour contrast pass?

Foreground: #B07BDB
Background: #fff
Colour contrast: 3.13:1
Result: this is more than 3:1, so it passes