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I mean we haven't teached this topic at school in my country. We have teached these another topics. Hehe! 😁
Oh.
Ok then first It's Not Possible Because For that Common ratio will be Equal to zero
And For second it doesn't produce the positive solutions. (Otherwise It will provide 80 digit long term solution which is not a accurate solution)
(1)The question had request that you have to "proof" if you think that is impossible.(It is not hard so please try it.)
(2)Wait how did you know the answer about the second question?