If a month begins on a Sunday, then the 1st is Sunday, the 8th is Sunday, and the 13th falls on Friday (1st = Sunday, so 6th = Friday, 13th = Friday). The 13th would only be Thursday if the month began on a Monday (1st = Monday means 13th = Thursday). Therefore the statement is false. Note: 'Thrusday' in the question is a typo for 'Thursday'.