what is the average ( arithmetic mean ) of the numbers 15 , 16 , 17 , 17 , 18 , and 19 ?
"the average of 15 , 16,17 , 18,19 ( sequence numbers ) is 17 & now average of 17 & 17 ( remaining digit from given list ) is 17 . hence answer is 17 . answer : c"
divide(divide(multiply(add(15, 17), add(divide(subtract(17, 16), 15), const_1)), const_2), add(divide(subtract(17, 15), 15), const_1))