If you have five apples and split them into 0 groups, they would have to vanish. Things can not simply be deleted from this world. This is why you can not group anything into a group of 0.
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you cant. You have to divide the bigger number first.
Undefined: You cannot divide by zero
Divide till you cant divide evenly
you cant divide mixed numbers
Not all linear functions have defined slope. In two dimension it is definet but in three dimensions it cant be defined; For that direction ratios are defined in mathematics.