Referring Q3-IAI-2014'Oct. States are as For railway engine 1)In yard, 2)operation, 3)maintenance, 4)retired. Transitions for engine are as Operation to yard Yard to operation Operation to maintenance ( for repair) Maintenance to yard ( before operation) Maintenance to retired (not repaired) In question they have asked to form kolmogorov diff. Eqn for "operation" state. I formed diff eqn for tPx22. In solution it is tPx12. Please explain which one is correct.
