Question: Element 1, 2, 3, ..., n are pushed into a stack in order and then popped. Suppose the sequence of popped elements are C1, C2,

Element 1, 2, 3, ..., n are pushed into a stack in order and then popped. Suppose the sequence of popped elements are C1, C2, ...en and ei n, then ez is equal to a. n- - 1 b. n - 1+1 C. d. Unknown
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