Problem #PRU-103802

Problems Number Theory Numeral systems Decimal number system Divisibility Divisibility of a number. General properties Discrete Mathematics Set theory and logic Set theory Set cardinality. One-to-one correspondence
 12–13  2.0

Problem

Which five-digit numbers are there more of: ones that are not divisible by 5 or those with neither the first nor the second digit on the left being a five?