উত্তর: R
ব্যাখ্যা:বছরে 1 বার ⇒ yeaR
মাসে 2 বার ⇒ Seven-HundRed Twenty HouRs
সপ্তাহে 3 বার ⇒ Sunday, Monday, Tuesday, Wednesday, ThuRsday, FRiday, SatuRday
দিনে 4 বার ⇒ One a.m., Two a.m., ThRee a.m., FouR a.m., Five a.m., Six a.m., Seven a.m., Eight a.m., Nine a.m., Ten a.m., Eleven a.m., Twelve p.m. , One p.m., Two p.m., ThRee p.m., FouR p.m., Five p.m., Six p.m., Seven p.m., Eight p.m., Nine p.m., Ten p.m., Eleven p.m., Twelve a.m.