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Review for Test Chapters 1 & 2 PAIR UP! For each formula below: 1.Explain what the formula would be used for 2.Find a problem on the review that uses the formula n(A ´ B) = n(A)× n(B) an = a1r n-1 n(A ∪ B) = n(A) + n(B) - n(A ∪ B) an = a1 + (n - 1)d 1+ 2 + 3 + ... + n = n(n + 1) / 2 • • • • • Cardinal number of a Cartesian product nth term of a geometric sequence Cardinal number of a union nth term of an arithmetic sequence Sum of the first n consecutive natural numbers