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Oops why am I still here at 2am

Pretty sure the question asked "what is the alkali metal hydroxide". So I had K+ for a few minutes then read that and scribbled K+OH at the last second. Hopefully it's close enough to get the mark hahah

I factorised 2^n + 3^n as (2+3)(2^(n-1) - 3*2^(n-2) + ... + 3^(n-1)) and assumed the right hand bracket could not be 5^(n-1) rip