If the pattern below follows the rule and ldquostarting with two every consecutive line has a number that is one less than twice the previous line and how many marbles must be in the sixth line?

To analyze the pattern, we start with 2 marbles in the first line. According to the rule, each subsequent line has a number that is one less than twice the previous line. Thus, the sequence will be:
1st line: 2
2nd line: (2 \times 2 - 1 = 3)
3rd line: (2 \times 3 - 1 = 5)
4th line: (2 \times 5 - 1 = 9)
5th line: (2 \times 9 - 1 = 17)
6th line: (2 \times 17 - 1 = 33)

Therefore, there must be 33 marbles in the sixth line.