Let S be the set of all positive integers that, when divided by 8, have a remainder of 5. What is the 72th number in this set?  Options.
A) 573
B) 608
C) 613
D) 616
E) 621

Rationale: the set s = { 5 , 13 , 21 , 29 , . . . . . . . . . . . . . . . . . . . . . } 1 st number = 8 * 0 + 5 = 5 2 nd number = 8 * 1 + 5 = 13 3 rd number = 8 * 2 + 5 = 21 72 th number = 8 * ( 72 - 1 ) + 5 = 573 answer = a
Answer: A