13 Coins Riddle

thought of the day: i always had a feeling that if you double your bet every time you lost, you’re gaurantee to win. meaning, if i lost $1 on my 1st bet, i’d bet $2. if i lost that, i’d bet $4 and etc meaning if i won, i’d be actually ahead. i always thought this as a failsafe plan, but always wondered why not many people followed it. as liam points out, the expected # of rounds before you win is infinity. if you havent taken a course on probability, it basically means you’re expected to play an infinite amount of games before winning. and by starting @ $1, after 20 rounds of lost, you’re already @ the $1 million mark.

spring break’s finally over. drove up today with decathanerd, cari, mechy, ohfuee, and dng. pretty tired. think i’m going to hit the sack soon, so short entry today.

so artemyst brought up an ancient riddle where you have 9 coins and 1 of them is a counterfeit. you have a scale which you can only use 2x (load up left and right side and it’ll tell you which side is heavier of if both sides are balanced) and the counterfeit coin is heaver. how do u find the counterfeit coin? really easy to solve. shouldn’t take you so long. then now i present the super uper duper hard riddle which took me a week to solve. think i finally solved it in one of my dreams back in high school. same scenario, but variables are a bit different. you have 13 coins. there is 1 counterfeit coin which you just know has a different weight (not sure if it’s heavier or lighter). you can only use the scale 3x. how do you do it? if you need hints, feel free to im me.

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