What positive integer is befire zero?
And why 0^0 has no value?
I just want to understand this
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You can think of the relation 0! = 1 as a mathematical convention (and yes, convention is the word mathematicians use to describe something that's held true simply by common agreement - e.g. the fact that 1 is not prime is essentially a convention, though a handful of 'eccentric' mathematicians think it ought to be granted prime status). Still, there are good reasons why 0! should equal 1. For example, if you want to work out, using the formula, what 7C7 is equal to, you get:DanaJ wrote:0! = 1 because some guys interested in math thought they should just have that rule a long time ago (we call it a convention in RO, but I'm not sure this is the correct translation for the word)... I don't know if there is an explanation here, you just have to take it as it is... Kindda like the weight of a kilo/pound or the volume of a liter...
What is the value of integer J ?
(1) |J| = J^(-1)
(2) J^J=1
From S1 we have that J=1. Sufficient.
From S2 we also learn that J is 1; 0^0 is a non-existent value.
The correct answer is D.