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Five Sisters (illustration)
FILE No.138Unsolved

Five Sisters

Difficulty ★☆☆about 5 minLogic PuzzleReading closelyTrick questions
He has five daughters. Above Nana, Nini, Nunu, and Nene, who is the other one?

Case Record

A story about a girl named Mary. Mary's father has five daughters. From the oldest, they are named Nana, Nini, Nunu, and Nene.

Your question

Who is the other daughter?

Case Files

Diagram

The five daughters of Mary's fatherNanaNiniNunuNene?Oldest →→ youngest"Mary's father has five daughters."Four names are known. Who is the fifth daughter?
Diagram

Hints

If you get stuck, open the hints one at a time, in order.

Open hint 1

Whose father is "Mary's father"?

Open hint 2

Is Mary included in the number of daughters?

Open hint 3

Is the pattern of names a clue?

Solve It

Your question

Who is the other daughter?

Choose the answer closest to the truth.

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The Truth

Mary

The answer is "Mary."

The problem says, "Mary's father has five daughters." Mary herself is one of those five.

You may want to answer "Nono," but the pattern of the names is no basis. There is also no need to think the name is unknowable.

Mary herself is one of the fiveNanaNiniNunuNeneMaryThe pattern of the names (Na, Ni, Nu, Ne, then No) is not evidence.
Diagram of the solution

Key Points

  • Read the subject carefully
  • Do not forget to count the person herself
  • Do not be pulled along by a pattern

Why people get fooled

Because the flow of "Nana, Nini, Nunu, Nene" makes you want to answer "Nono."

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