5.4 Binomial Coefficients Theorem 1: The binomial theorem Let x and y be variables, and let n be a nonnegative integer. Then Example 3: What is the coefficient.

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Presentation transcript:

5.4 Binomial Coefficients Theorem 1: The binomial theorem Let x and y be variables, and let n be a nonnegative integer. Then Example 3: What is the coefficient of x 12 y 13 in the expansion of (x + y) 25 ? 1

The Binomial Theorem Corollary 1: Let n be a nonnegative integer. Then Corollary 2: Let n be a positive integer. Then Corollary 3: Let n be a nonnegative integer. Then 2

Pascal’s Identity and Triangle Theorem 2: Pascal’s Identity Let n and k be positive integers with n  k. Then 3

Pascal’s Identity and Triangle 4 FIGURE 1 Pascal’s Triangle.

Some Other Identities of the Binomial Coefficients Theorem 3: Vandermonde’s Identity Let m, n, and r be nonnegative integers with r not exceeding either m or n. Then Corollary 4: If n is nonnegative integer, then Theorem 4: Let n and r be nonnegative integers with r  n. Then 5