Let S be the set of positive integers that divide at least one of the numbers 1; 11; 111; 1111; ... For example, 3 is in S since 3 divides 111 . The number of elements in S that are less than 100 is (a) 22 (b) 28 (c) 34 (d) 40 (e) 48
Let S be the set of positive integers that divide at least one of the numbers 1; 11; 111; 1111; ... For example, 3 is in S since 3 divides 111 . The number of elements in S that are less than 100 is
(a) 22 (b) 28 (c) 34 (d) 40 (e) 48
