Answer:
Say you have a key in a dictionary, or a key in a 2-d list. When you insert(), you are destructively iterating the original list and modifying it to reflect the insert() component. In order for the key to get lost you would have to do say insert(len: :1) which would remove the second key and therefore cause it to get "lost" because it will be destructivsly removed from its assignment and replaced by whatever you choose to insert.
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Answer:
The number of presentation groups of 3 students that can be selected from a group of 5 students equals 10.
Explanation:
The number of different presenters equals the no of possible combinations of 3 students from a pool of 5 students.
Thus the number of possible combinations equals

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Involvement is the answer just took it. thank you
Where are the statements so i may help you