if 99 < x < 199 and 10 < y < 100 , then the product xy can not be equal to :
correct answer : ( b ) determine the range of xy by multiplying the two extremes of each individual range together . the smallest value of xy must be greater than 99 * 10 . the largest value must be less than 199 * 100 . this means that 990 < xy < 19,900 . ( b ) is outside of this range , so it is not a possible product of xy .
add(100, const_1)