Look at the pattern and decide what number comes next.
1 2 3 4 3 2 1 2 3 4 5 4 ?
Based on the pattern observed, the numbers alternate in ascending and descending order.
Following the pattern, the next number should be 3.
1 2 3 4 3 2 1 2 3 4 5 4 ?
Following the pattern, the next number should be 3.