Question 1718: Normalize a Candidate before a Fixed-Factor Closed-Form Audit

Original question and givens

Use fixed discrete time steps and one exact nonnegative rational factor throughout. This is not a continuous-time model or an empirical population prediction; signed initial quantities and the zero case must retain their specified values. Use exact rational inputs. Normalize denominator signs and reduce output fractions; print integers without /1. These specified-value checks do not identify truncation, rounding, measurement or model-error causes. initial=3/1, factor=2/7, n=2, candidate=12/49. Give (initial, factor, n, exact term, normalized candidate, equal?).

• G001 — Use fixed discrete time steps and one exact nonnegative rational factor throughout. This is not a continuous-time model or an empirical population prediction; signed initial quantities and the zero case must retain their specified values. Use exact rational inputs. Normalize denominator signs and reduce output fractions; print integers without /1. These specified-value checks do not identify truncation, rounding, measurement or model-error causes. initial=3/1, factor=2/7, n=2, candidate=12/49. Give (initial, factor, n, exact term, normalized candidate, equal?).

Definition and scope

Use the original question domain, assumptions and cited MKO definitions. This item has second-context mathematical and bilingual review, with the model, answer and every arithmetic step independently recomputed from the original parameters; the source question remains a candidate.

• mko-discrete-exponential-growth

Step-by-step derivation

factor q=2/7≥0

X_(k+1)=q·X_k

X₀=3; n=2

n=0 uses the initial value; an empty product equals1

X_1 := mul(3, 2/7)

X_1 = 6/7

X_2 := mul(6/7, 2/7)

X_2 = 12/49

X_k=X₀q^k ⇒ X_(k+1)=qX_k=X₀q^(k+1)

X_n=X₀q^n for every nonnegative integer n

(2/7)^2

q^n = 4/49

closed-form X_n := mul(3, 4/49)

closed-form X_n = 12/49

computed X_2=12/49; candidate=12/49

candidate correct at this n: Yes

Reverse checks

• S008 · premise_and_result_audit — Check against the original data and this step's premises; a one-way implication is not an equivalence.
• S007 · premise_and_result_audit — Recompute closed-form X_n with exact rational arithmetic, not rounded decimals.
• S006 · premise_and_result_audit — Check against the original data and this step's premises; a one-way implication is not an equivalence.
• S005 · premise_and_result_audit — Check against the original data and this step's premises; a one-way implication is not an equivalence.
• S004 · premise_and_result_audit — Recompute X_2 with exact rational arithmetic, not rounded decimals.
• S003 · premise_and_result_audit — Recompute X_1 with exact rational arithmetic, not rounded decimals.
• S002 · premise_and_result_audit — Check against the original data and this step's premises; a one-way implication is not an equivalence.
• S001 · premise_and_result_audit — Check against the original data and this step's premises; a one-way implication is not an equivalence.

Result

(3, 2/7, 2, 12/49, 12/49, Yes)

The full substitutions and premise checks give the original answer; source identity,format and status are unchanged.

This question review and source binding

Review date: 2026-10-26

Original questions, answers, step expressions, numeric ASTs and historical records are retained. Source candidate labels remain historical and are not overwritten as formal proof.