2022 AMC 10A Problems/Problem 24
Revision as of 04:08, 12 November 2022 by Pi is 3.14 (talk | contribs) (→Solution By Omega Learn with Complementary Counting)
Problem
How many strings of length formed from the digits
,
,
,
,
are there such that for each
, at least
of the digits are less than
? (For example,
satisfies the condition because it contains at least
digit less than
, at least
digits less than
, at least
digits less than
, and at least
digits less than
. The string
does not satisfy the condition because it does not contain at least
digits less than
.)
Video Solution By OmegaLearn using Complementary Counting
~ pi_is_3.14