no this is wrong the ev of switching is $0 not +$25. and it is not better to gain $100 than lose $50 when you already have $100.
50% loss is exactly equal to 100% gain because if you lose that bet. now you need 100% gain yo get back to the origianl $100. ev to switch is 0, and the advantge in edge to switch is also zero. from that perspective of of a card counter we dont tend to like risking money without an edge so we should never switch.
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