What is true about tuples? (Choose two.)

Question

Options

• ATuples can be concatenated using the + operator
• BAn empty tuple can be written as tuple ().
• CEach element of a tuple must be unique.
• DIf tup is a non-zero-length tuple, del tup[0] will delete its first element.

• A
  83% (49)
• B
  3% (2)
• C
  5% (3)
• D
  8% (5)

Explanation

Tuples support concatenation with + just like strings and lists - (1, 2) + (3, 4) produces (1, 2, 3, 4) - making A correct. B is also correct (and likely the intended second answer): an empty tuple can be written as tuple() in addition to (), so the answer key listing only A appears incomplete.

Why C is wrong: tuples place no uniqueness constraint on their elements - (1, 1, 2) is perfectly valid. Uniqueness is a property of sets, not tuples.

Why D is wrong: tuples are immutable, so del tup[0] raises a TypeError. You cannot add, remove, or modify individual elements after creation.

Memory tip: Think of a tuple as a "frozen list." Everything a list can do non-destructively (concatenate, slice, index) a tuple can do too - but anything that would change the sequence (delete, append, assign) is off-limits.

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