Question Number 177132 by mokys last updated on 01/Oct/22
Commented by mr W last updated on 01/Oct/22
$${instead}\:{of}\:{posting}\:{these}\:?????,\:{you} \\ $$$${can}\:{easily}\:{try}\:{by}\:{yourself}: \\ $$$${A}=\left(−\frac{\mathrm{1}}{\cancel{\mathrm{3}}}\right)\left(−\frac{\cancel{\mathrm{3}}}{\cancel{\mathrm{5}}}\right)\left(−\frac{\cancel{\mathrm{5}}}{\cancel{\mathrm{7}}}\right)…\left(−\frac{\cancel{\mathrm{4}{k}−\mathrm{1}}}{\mathrm{4}{k}+\mathrm{1}}\right) \\ $$$$=\left(−\mathrm{1}\right)^{\mathrm{2}{k}} \frac{\mathrm{1}}{\mathrm{4}{k}+\mathrm{1}} \\ $$$$=\frac{\mathrm{1}}{\mathrm{4}{k}+\mathrm{1}}\:\checkmark \\ $$
Commented by mokys last updated on 01/Oct/22
$$??????? \\ $$
Commented by Tawa11 last updated on 02/Oct/22
$$\mathrm{Great}\:\mathrm{sir} \\ $$