In the sequence 12, 24, 36, 48, 60, how many times does the number 24 occur?

A. 1

In the sequence 3, 6, 9, 12, 15, 18, how many times does the number 12 occur?

A. 1

In the sequence 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, how many times does the number 5 occur?

A. 1

In the sequence 2, 4, 6, 8, 10, 12, 14, how many times does the number 8 occur?

A. 1

In the sequence 7, 14, 21, 28, 35, 42, how many times does the number 21 occur?

B. 1