✔ "If n is divisible by five, the the last digit of n is zero.""If the last digit of n is zero, then n is divisible by five.""If the last digit of n is not zero, then n is not divisible by five.""If n is not divisible by five, then the last digit of n is not zero."
Answer
A
✔ "If n is divisible by five, the the last digit of n is zero."
B
"If the last digit of n is zero, then n is divisible by five."
C
"If the last digit of n is not zero, then n is not divisible by five."
D
"If n is not divisible by five, then the last digit of n is not zero."