the average ( arithmetic mean ) of the integers from 25 to 225 , inclusive , is how much lower than the average of the integers from 50 to 1050 inclusive ?
"for an ap the mean or average of series is average of first and last term . so , average of numbers between 50 to 1050 , inclusive = ( 50 + 1050 ) / 2 = 550 average of numbers between 25 to 225 , inclusive = ( 25 + 225 ) / 2 = 125 difference = 550 - 125 = 425 answer is d"
subtract(divide(add(25, 225), const_2), divide(add(50, 1050), const_2))