Final answer:
The question is about identifying and analyzing a sequence of ticket sales numbers which show an exponential decrease. Each night's sales reduce by a different amount, with the differences following a multiple of 3 pattern.
Step-by-step explanation:
The subject in question relates to the sequence of numbers representing ticket sales over the first five nights. We are asked to analyze this sequence which starts at 400 tickets and progressively decreases each night. The sequence is: 400, 399, 396, 387, and 360. This is not an arithmetic or geometric sequence due to the varying differences between terms. To define the pattern, we must look at how much the number of ticket sales decreases each night. The differences between the sales are -1, -3, -9, and -27. It seems that these differences themselves form a pattern, each being a multiple of 3. This pattern shows an exponential decrease in sales with each night represented as a sequence.