The chances of getting success. It is the possibility that an individual will win something or get the desired result. The larger the source area, the more are the chances of being lucky or being closer to the achievement of results. It can be considered like the surface area concept generally in use.
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Further Reading/ References
https://stample.co/link/stamples/522a1cf3ed50cb47f6021f04/how-to-increase-your-luck-surface-area