find the sum of first 30 natural numbers
"explanation : sum of n natural numbers = n ( n + 1 ) 2 = 30 ( 30 + 1 ) 2 = 30 ( 31 ) 2 = 465 answer : option c"
add(divide(divide(30, divide(divide(divide(divide(divide(30, const_2), const_2), const_2), const_2), const_2)), const_2), add(const_1, sqrt(divide(divide(30, divide(divide(divide(divide(divide(30, const_2), const_2), const_2), const_2), const_2)), const_2))))