K ksheikh_10 New member Joined Feb 28, 2021 Messages 2 Feb 28, 2021 #1 1. How many natural numbers less than 10 000 have at least one “2” in them?
Dr.Peterson Elite Member Joined Nov 12, 2017 Messages 16,870 Feb 28, 2021 #2 ksheikh_10 said: 1. How many natural numbers less than 10 000 have at least one “2” in them? Click to expand... Answer this first: How many natural numbers less than 10 000 have no digit 2?
ksheikh_10 said: 1. How many natural numbers less than 10 000 have at least one “2” in them? Click to expand... Answer this first: How many natural numbers less than 10 000 have no digit 2?