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

A. 0

In the sequence 12, 15, 18, 21, 24, how many times does the number 21 occur?

A. 1

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

A. 1

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

A. 1

In the sequence 100, 200, 300, 400, 500, how many times does the number 250 occur?

B. 0