how many multiples of 2 are there between 101 and 999 ?
"2 multiples are 102 , 104,106 , - - - - - - - - - , 994 , 996,998 it should be mentioned whether 1 and 89 are inclusive . the answer is ( 998 - 102 ) / 2 + 1 = 449 answer is e"
add(divide(subtract(999, 101), 2), const_1)