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Maximize and minimize difference

Alex and Billy are playing a game where Alex says a number and Billy replaces a # with the said number(Billy can choose the # which must be replaced but must replace it by the number said by Alex). Alex wants to maximize the difference and Billy wants to minimize it. If both players follow perfect strategy, what will be the difference obtained?(Solve for (i) difference meaning magnitude and (ii) difference meaning 1st number -2nd number with sign.)

Note by Ajinkya Shivashankar
2 weeks ago

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