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nincompoopBest ResponseYou've already chosen the best response.1
you can't prove it
 11 months ago

nincompoopBest ResponseYou've already chosen the best response.1
it's not always the case
 11 months ago

mukushlaBest ResponseYou've already chosen the best response.1
its true for n>3 u may use mathematical induction, for n=4\[32<3^4=81\]now suppose that the statement is true for some n=k>4 this means\[3k+20<3^k\]and prove that for \(n=k+1\)\[3(k+1)+20<3^{k+1}\]i think u can do it from here :) let me know if this is unclear
 11 months ago
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