
DISCUSS • DISCOVER: Why ls (;) the Same as C(n,r)? This explains why binomial coefficients (;) that appear in expansion of (x + y)" are the same as C(n, r). num-bar Of ways of choosing r objects from n objects. first. Note that expanding a binomial using only the Distributive property gives
(a) Expand
(b) Write all that the term represents
(C) Note that tie two x's appear in all possible positions. Conclude that the number of terms that represent
(d) In general, explain why (;) in the Binomial theorem is the same as C(n, r).

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Chapter 9 Solutions
College Algebra
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