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HMMT 二月 2001 · 冲刺赛 · 第 36 题

HMMT February 2001 — Guts Round — Problem 36

专题
Discrete Math / 离散数学
难度
L3
来源
HMMT

题目详情

  1. [4] Count the number of sequences 1 ≤ a ≤ a ≤ · · · ≤ a of integers with a ≤ i 1 2 5 i for all i .
解析
  1. [4] Count the number of sequences 1 ≤ a ≤ a ≤ · · · ≤ a of integers with a ≤ i 1 2 5 i for all i . Solution: C (number of terms) = C (5) = 42 .