Increasing the power by 1 will add another multiplicator of the value of the base. So while 2^2 is 2*2, 2^3 is 2*2*2. So again, if you have the base 2 and increase the power by one you just add a *2. If you reduce the power by 1 it is taking away a “*2” which is the same as divinding by the base.
So if 2^1 is just 2. And you reduce the power by one then you get 2^0 which is the just dividing the base value by itself which always results in a 1.
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