For the first statement:
isn't n^5*(1-n^4) the same as n^5/n^5n^4??
In this case would A be sufficient. What am I missing?
You mean n^5*(1-n^4) the same as
Both of them are incorrect.
First, n^5*(1-n^4) = n^5 - n^9
(1) [n^5/n^5n]^4 = n^20/n^20n
(2) n^5/[(n^5n)^4] = n^5/n^20n
So (1) and (2) differ from n^5 - n^9
Hope it's clear.
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