Mathematics, 12.12.2020 17:00 ashleyprescot05
What is the coefficient of the third term in the binomial expansion of (a + b)6? 1 15 20 90
Answers: 3
is given by:-
, n= 6 
![=\ \dfrac{6!}{4!2!}a^4b^2\ \ \ [^nC_r=\dfrac{n!}{r!(n-r)!}]\\\\=\dfrac{6\times5\times4!}{4!\times2}a^4b^2\\\\=3\times5a^4b^2\\\\ =15a^4b^2](/tpl/images/0977/6912/417f6.png)
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What is the coefficient of the third term in the binomial expansion of (a + b)6? 1 15 20 90...
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