One Fifth as Pandigital Fraction
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Theorem
There are $12$ ways $\dfrac 1 5$ can be expressed as a pandigital fraction:
- $\dfrac 1 5 = \dfrac {2697} {13485}$
- $\dfrac 1 5 = \dfrac {2769} {13845}$
- $\dfrac 1 5 = \dfrac {2937} {14685}$
- $\dfrac 1 5 = \dfrac {2967} {14835}$
- $\dfrac 1 5 = \dfrac {2973} {14865}$
- $\dfrac 1 5 = \dfrac {3297} {16485}$
- $\dfrac 1 5 = \dfrac {3729} {18645}$
- $\dfrac 1 5 = \dfrac {6297} {31485}$
- $\dfrac 1 5 = \dfrac {7629} {38145}$
- $\dfrac 1 5 = \dfrac {9237} {46185}$
- $\dfrac 1 5 = \dfrac {9627} {48135}$
- $\dfrac 1 5 = \dfrac {9723} {48615}$
Proof
Can be verified by brute force.