let s be the set of all positive integers that , when divided by 8 , have a remainder of 5 . what is the 81 th number in this set ?
"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 81 th number = 8 * ( 81 - 1 ) + 5 = 645 answer = e"
add(multiply(subtract(81, const_1), 8), 5)