پاسخ : صفحه ی هم ارز
safhe haye bedune tagharon mishe c(49,2) - c(24,1) ke darvaghe tedade safhe haye ba tagharon mishe c(24,1) ke tush ba entexabe yek noghte noghteye baad entexab shode xob hala bedune tagharon ha 4 ta ham arz daran ke javab (c(49,2) - c(24,1))/4 + c (24,1) =312 mishe