Question Number 131006 by Study last updated on 31/Jan/21
$${if}\:{a}_{\mathrm{1}} =\frac{\mathrm{4}{n}+\mathrm{3}}{\mathrm{2}{n}ā\mathrm{1}}\:\:\:\:\:\:,\:\:\:{a}_{\mathrm{10}} =\frac{\mathrm{6}{n}+\mathrm{5}}{\mathrm{2}{n}ā\mathrm{1}}\:\:\:\:;\:\:\:{a}_{\mathrm{30}} =? \\ $$