Which Type Is More Common?

★ 5/10combinatorics number theory Counting Estimation

Problem

Call a $2020$ -digit number type $A$ if it can be written as the product of two $1010$ -digit numbers, and type $B$ otherwise. Which type is more common: type $A$ or type $B$ ?

Answer

Solution

Difficulty	5/10
Topics	combinatorics, number theory, Counting, Estimation

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