how many positive factors of 42 are not factors of 56 ?
"42 = 2 * 3 * 7 . so , total number of factors for 42 = 2 * 2 * 2 = 8 factors for 42 = 1 , 2,3 , 6,7 , 14,21 and 42 56 = 2 * 2 * 2 * 7 so , total number of factors for 56 = 4 * 2 = 8 factors of 56 = 1 , 2,4 , 7,8 , 14,28 and 56 . factors same in 42 and 56 are 1 , 2,7 and 14 . hence , answer will be d ."
divide(subtract(56, const_10), const_10)