Question Number 31953 by 24444355 last updated on 17/Mar/18
$$\mathrm{If}\:{a},\:{b},\:{c},\:{d}\:\mathrm{are}\:\mathrm{in}\:\mathrm{GP},\:\mathrm{then}\:\left({a}^{\mathrm{3}} +{b}^{\mathrm{3}} \right)^{−\mathrm{1}} ,\: \\ $$$$\left({b}^{\mathrm{3}} +{c}^{\mathrm{3}} \right)^{−\mathrm{1}} ,\:\left({c}^{\mathrm{3}} +{a}^{\mathrm{3}} \right)^{−\mathrm{1}} \:\mathrm{are}\:\mathrm{in} \\ $$
Commented by Rasheed.Sindhi last updated on 18/Mar/18
$$\mathrm{Why}\:\mathrm{is}\:{d}\:\mathrm{disappeared}\:\mathrm{in}\:``\mathrm{after}\:\mathrm{then}''\:\mathrm{part}? \\ $$
Commented by rahul 19 last updated on 18/Mar/18
$${i}\:{think}\:{there}\:{should}\:{not}\:{be}\:{any}\:{d}\:. \\ $$