if you write down all the numbers from 1 to 100 , then how many multiples of 3 ?
division rule for 3 - sum of all digits is multiple of 3 3 6 9 12 15 18 21 24 27 30 33 36 39 42 45 48 51 54 57 60 63 66 69 72 75 78 81 84 87 90 93 96 99 ans - e
divide(subtract(100, const_1), 3)