Respuesta :
30 days, hath September. April June, and November. All the rest have 31, except for February, which has 28. And 29 on a leap year.
Answer: February is the month that serves as the counterexample.
Step-by-step explanation: February has 28 days most years, 29 days in a leap year. So it is an an example that disproves the statement that all months have at least 30 days.