# Why is $0/0$ ot equal to $1$? [duplicate]

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If $3/3=1, 2/2=1, 1/1=1$, then why is $0/0$ undefined? Why is it not $1$?

## marked as duplicate by Winther, user147263, yoknapatawpha, Thomas, Eric WofseyOct 8 '15 at 18:08

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• If $1 = 0/0$, what are you going to do about $(0+0)/0$? – TokenToucan Oct 8 '15 at 15:44
• There can´t be a multiplicative inverse to $0$ because $0 x=0\neq1$ – Peter Melech Oct 8 '15 at 15:45
• Division by zero is not defined in the "real number" system. It may be defined in other number systems. So tell us what number system you want to use... – GEdgar Oct 8 '15 at 16:06

## 1 Answer

0/0 is not defined because you can find any couple of numbers a,b for which 0*a = 0*b . if defined, we would have 0/0 = a/b, and this for any possible values of a and b. Which makes way to many values for one same given number. ;-)