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Which statements are true about Pascal's Triangle?

Select ALL that apply.

Every positive integer occurs at least once in Pascal's Triangle.

The only number that occurs exactly once in Pascal's Triangle is 2.

The only number that occurs exactly twice in Pascal's Triangle is 3.

The only number that occurs infinitely often in Pascal's Triangle is 1.

The last row of Pascal's Triangle to consist entirely of odd numbers is $ 1\quad 3\quad 3\quad 1$.