TASK DEFINITION: This task is about creating an unanswerable question based on a given passage. Construct a question that looks relevant to the given context but is unanswerable. Following are a few suggestions about how to create unanswerable questions:
(i) create questions which require satisfying a constraint that is not mentioned in the passage
(ii) create questions which require information beyond what is provided in the passage in order to answer
(iii) replace an existing entity, number, date mentioned in the passage with other entity, number, date and use it in the question
(iv) create a question which is answerable from the passage and then replace one or two words by their antonyms or insert/remove negation words to make it unanswerable.
PROBLEM: Passage: The best, worst and average case complexity refer to three different ways of measuring the time complexity (or any other complexity measure) of different inputs of the same size. Since some inputs of size n may be faster to solve than others, we define the following complexities:

SOLUTION: What are the three secondary expressions used to represent case complexity? 

PROBLEM: Passage: The RIBA Guide to its Archive and History (1986) has a section on the "Statutory registration of architects" with a bibliography extending from a draft bill of 1887 to one of 1969. The Guide's section on "Education" records the setting up in 1904 of the RIBA Board of Architectural Education, and the system by which any school which applied for recognition, whose syllabus was approved by the Board and whose examinations were conducted by an approved external examiner, and whose standard of attainment was guaranteed by periodical inspections by a "Visiting Board" from the BAE, could be placed on the list of "recognized schools" and its successful students could qualify for exemption from RIBA examinations.

SOLUTION: When does the Royal Institute's Guide indicate the last RIBA Board was established?

PROBLEM: Passage: Relaxed zoning rules and special parking privileges for churches, the tax-free status of church property, the fact that Christmas is a federal holiday, etc., have also been questioned, but have been considered examples of the governmental prerogative in deciding practical and beneficial arrangements for the society. The national motto "In God We Trust" has been challenged as a violation, but the Supreme Court has ruled that ceremonial deism is not religious in nature. A circuit court ruling affirmed Ohio's right to use as its motto a passage from the Bible, "With God, all things are possible", because it displayed no preference for a particular religion.

SOLUTION:
Why have perks like relaxed zoning rules and special parking privileges been disallowed for churches?