how many integers between 324,700 and 387,600 have tens digit 1 and units digit 3 ?
"the integers are : 324,713 324,813 etc . . . 387,513 the number of integers is 3876 - 3247 = 629 the answer is b ."
subtract(387,600, add(add(multiply(const_2, const_100), multiply(add(const_3, const_4), const_10)), const_2))