lean_workbook_plus_9421

⚠️ Retired — specification defect

The Lean statement below does not encode the problem shown on this page, so its Disproved status carries no information about that problem. Do not import this node or use it as a dependency.

Exactly why is The probability of not rolling a $7$ is $\frac{5}{6}$

Why this node was retired

The posted statement is

theorem lean_workbook_plus_9421 : 1 - (1 / 6) = 5 / 6   :=  by sorry

State the numerical identity over ℚ or ℝ. A probability claim additionally needs the underlying dice experiment.

The recorded counterexample refutes the statement as encoded. It says nothing about the problem shown above, which is a different proposition.

Proposed corrected statement

State the numerical identity over ℚ or ℝ. A probability claim additionally needs the underlying dice experiment.

Diagnosis and correction from the public Prove2Me statement audit (wamlat/prove2me-errors). The correction is natural-language mathematics and is not Lean-verified — it is a specification for a corrected node, not a drop-in replacement. No corrected replacement node exists yet.