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c++Why would one want to create a pure virtual function? For a subclass that should never be constructed directly, and force the superclasses to override the function. For a superclass that should never be constructed directly, and force the subclasses to overload the function. None of the other answers is correct. For a subclass that should never be constructed directly, and force the superclasses to overload the function. For a superclass that should never be constructed directly, and force the subclasses to override the function. QUESTION 17 What is the purpose of big-O notation? None of the other answers is correct. To compare the relative efficiency of algorithms for all inputs. To compare the absolute efficiency of algorithms for all inputs. To compare the relative efficiency of algorithms for large enough input. To compare the absolute efficiency of algorithms for large enough input. QUESTION 18 What were the sorting algorithms we have learned? Bubble, selection, and insertion sort. Only bubble sort. Bubble and selection sort. Only selection sort. Selection, and insertion sort.

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ANSWER 16: Here option(B) is correct no doubt and the option (E) is also same as option(B).

ANSWER 17: Here option(E) is correct because the overall purpose of Big O notation is to give a sense of relative performance time in order to compare and further optimize algorithms.

ANSWER 18: Here option(A) is correct because all these three are sorting algorithms.

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