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2017/03/28
スマホのガチャについて！例えば当たりが1％だとして100回せばほぼ１枚は当たるんじゃね？そう思いますよね？でも100連回して１枚以上出る確率は･･･約63％です！！(°口°๑)つまり残りの4割弱の人は1枚も出ないんです( ´･ω ก`...
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