Math Problem Statement
アイテムXが1つ獲得できた時点でガチャをやめる。n回目までにアイテムを獲得できる確率が80%を超える。このような自然数nのうち最小の物をもとめよ。
Solution
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Math Problem Analysis
Mathematical Concepts
Probability Theory
Geometric Series
Exponential Functions
Formulas
Geometric series sum formula
Exponential function probability formula
Theorems
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Suitable Grade Level
Advanced High School
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