In the sequence 100, 200, 300, 400, 500, how many times does the number 600 occur?

A. 0

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

A. 1

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

A. 0

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

A. 1

In the sequence 5, 10, 15, 20, 25, 30, how many times does the number 15 occur?

A. 1