Question Number 74005 by mhmd last updated on 17/Nov/19
$${find}\:{C}_{\mathrm{8}} ^{\mathrm{15}} +{C}_{\mathrm{9}} ^{\mathrm{15}} −{C}_{\mathrm{7}} ^{\mathrm{15}} −{C}_{\mathrm{6}} ^{\mathrm{15}} \:? \\ $$$${pleas}\:{help}\:{me}\:{sir}\:? \\ $$
find-C-8-15-C-9-15-C-7-15-C-6-15-pleas-help-me-sir-