Somebody already gave this answer, but I’ll give it a go:
x/0 is defined as the number y such that y*0 = x.
But y*0 is always zero. Thus if x is not 0, then x/0 is “undefined.” It’s not a number.
Now what about when x is 0?
0/0 is defined as the number z such that z*0 = 0.
But this is true for *any* number z. Thus 0/0 is “indeterminate.” It’s not a number.
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