text: math conundrum? what does 0/0 = ? a. undefined b. 0 c. 1 d. (enter own answer) for the most part, i will second gopal's answer with a little bit of detail.  normally, division by 0 is undefined, so the people who said that are telling the absolute mathematical truth.  but there are many forms where 0/0 is simply indeterminate.  take for instance, the limit as x approaches zero of sin(x)/x  both the numerator and denominator are defined at x = 0, so the limit would seem to be 0/0. but this doesn't tell the story of what the ratio does as x approaches 0.  taking x to be a radian measure, let's try a few values for x:  x = 0.1 => sin(x) = 0.099833416 x = 0.01 => sin(x) = 0.009999833 x = 0.001 => sin(x) = 0.000999999  what you might notice is that x approaches 0, x and sin(x) get closer and closer together. that must mean that as x approaches 0, sin(x)/x approaches 1. the indeterminate form 0/0 doesn't tell us anything about the rate at which both functions approach 0.  of course, this doesn't mean that all indeterminate forms 0/0 have a value of 1. it depends on what you can figure out about the response of the parts of the ratio as x approaches some value that makes the ratio indeterminate. in calculus, there is a technique called l'hopital's rule that can be used to find limits of functions that have indeterminate forms like 0/0 and infinity/infinity.