Each element has a different number, which stipulates that it must be entered into the stack in ascending order of numbers.

• Each element has a different number, which stipulates that it must be entered into the stack in ascending order of numbers. The order of leaving is not limited. Each element must enter and exit the stack once, and the entire process must comply with the stacking last-in-first-out rule. The result can produce different permutation orders. (a) There are

  Each element has a different number, which stipulates that it must be entered into the stack in ascending order of numbers. The order of leaving is not limited. Each element must enter and exit the stack once, and the entire process must comply with the stacking last-in-first-out rule. The result can produce different permutation orders. (a) There are currently four elements, numbered 1, 2, 3, and 4 respectively. If you want to use the above method to arrange them, what kind of arrangement orders are possible? (10%) (b) If the question is changed to n elements, how many possible arrangements are there? (5%)
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  (a) The possible arrangement orders for the four e…