Question Number 76740 by benjo 1/2 santuyy last updated on 30/Dec/19
$$\mathrm{15}\:\mathrm{persons},\:\mathrm{among}\:\mathrm{whom}\:\mathrm{are}\:{A}\:\mathrm{and}\:{B}, \\ $$$$\mathrm{sit}\:\mathrm{down}\:\mathrm{at}\:\mathrm{random}\:\mathrm{at}\:\mathrm{a}\:\mathrm{round}\:\mathrm{table}. \\ $$$$\mathrm{The}\:\mathrm{probability}\:\mathrm{that}\:\mathrm{there}\:\mathrm{are}\:\mathrm{4}\:\mathrm{persons} \\ $$$$\mathrm{between}\:{A}\:\mathrm{and}\:{B}\:\mathrm{is} \\ $$
Commented by mr W last updated on 30/Dec/19
$${p}=\frac{{C}_{\mathrm{4}} ^{\mathrm{13}} ×\mathrm{4}!×\mathrm{2}×\mathrm{9}!}{\mathrm{14}!}=\frac{\mathrm{1}}{\mathrm{7}} \\ $$
Commented by benjo 1/2 santuyy last updated on 30/Dec/19
$${thank}\:{you}\:{sir} \\ $$
Commented by mr W last updated on 30/Dec/19
$${is}\:{the}\:{answer}\:{correct}? \\ $$
Commented by benjo 1/2 santuyy last updated on 30/Dec/19
$${yes}\:{sir}.\:{your}\:{ans}\:{correct} \\ $$
Commented by mr W last updated on 30/Dec/19
$${thanks}\:{sir}! \\ $$
Commented by benjo 1/2 santuyy last updated on 30/Dec/19
$${sir}\:\:{can}\:{this}\:{application}\:{be}\:{installed} \\ $$$${on}\:{a}\:{laptop}? \\ $$
Commented by mr W last updated on 30/Dec/19
$${i}\:{don}'{t}\:{think}\:{so}. \\ $$
Commented by Kunal12588 last updated on 30/Dec/19
$${you}\:{may}\:{use}\:{bluestack} \\ $$