1, Write down an inclusion–exclusion formula for |A ∪ B ∪ C ∪ D| 2. How many integers between 1 and 1000, inclusive, are divisible by one or more of 3, 5, and 7? 3. How many integers between 1 and...

1, Write down an inclusion–exclusion formula for |A ∪ B ∪ C ∪ D|

2. How many integers between 1 and 1000, inclusive, are divisible by one or more of 3, 5, and 7?

3. How many integers between 1 and 1000, inclusive, are divisible by one or more of 6, 7, and 8?