Hi, I'm Jenell... I am just joining so maybe someone can help me out with something I'm curious about. :) Okay... so My husband asked me to figure out how many variations of a 4 digit number (like a pin number) you could come up with... and without writing it all down I was hoping to figure it out... He's trying to challenge me since I just did really good in my math class this last quarter. lol I came up with the following... am I completley wrong? Anyone know the answer? take 1000, 1100, 1200, 1300, 1400, 1500, 1600, 1700, 1800, 1900 & 99 an add them all up... because that would cover all of the variations of 1000 that you could use... and then times that by 10 because there are 10 numbers on a key pad... and then you'd get 145,990 variations... Anyone know? Help!