how many integers from 40 to 200 , inclusive , are divisible by 3 but not divisible by 7 ?
"we should find # of integers divisible by 3 but not by 3 * 7 = 21 . # of multiples of 21 in the range from 40 to 200 , inclusive is ( 189 - 42 ) / 21 + 1 = 8 ; 53 - 8 = 45 . answer : e ."
divide(200, const_10)