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Somewhere in the Bhagavad Gita there is this quote: "You have a right to perform your prescribed duty, but you are not entitled to the fruits of action. Never consider yourself to be the cause of the results of your activities, and never be attached to not doing your duty.". So you have a duty do your best but there is no guarantee that it will result in success. There is still an element of Karma or luck, whatever you may call it.