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

A. 1

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

A. 1

In the sequence 1, 3, 5, 7, 9, 11, how many times does the number 6 occur?

C. 0

In the sequence 10, 20, 30, 40, 50, how many numbers are multiples of 15?

A. 1

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

A. 1