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。答えは161回です。
Solution
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Math Problem Analysis
Mathematical Concepts
Probability
Exponential Functions
Logarithms
Formulas
Probability calculation formula P(n) = 1 - (1-p)^n
Theorems
-
Suitable Grade Level
High School
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