Answer:
The expression is "t[k]".
Explanation:
In the question, it is defined that variable k refers to positive integer and variable t refers to a tuple that holds at least k+1 element. The expression for defining the kth element of t is t[k].
- Where variable t is tuple that collects a sequence of immutable (in-built) Python objects. To define tuple we use the parentheses.
- The main purpose to use tuple in this question is that it cannot be changed.