In the sequence 1, 3, 5, 7, 9, 11, how many times does the number 4 occur?

A. 0

In the sequence 4, 8, 12, 16, 20, 24, how many times does the number 16 occur?

A. 1

In the series 4, 8, 12, 16, 20, how many times does the number 12 appear?

A. 1

In the sequence 10, 20, 30, 40, 50, how many times does the number 30 occur?

A. 1

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

A. 1