4. What is the value of the 6th term of the expansion $(a + b)^9$? $84a^3b^6$ $84a^6b^3$ $126a^4b^5$ $126a^5b^4$
Added by Lourdes B.
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.. + C(9,9)b^9 where C(n,r) represents the binomial coefficient "n choose r". Show more…
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