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

A. 1

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

B. 0

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

A. 1

In the sequence 0, 1, 1, 2, 3, 5, how many times does the number 1 occur?

B. 2

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

A. 1