Question:
In the expansion \({\left( {2a – b} \right)^5}\), the coefficient of the third term is equal to:
Reference explanation:
Correct Answer: GET
We have: \({\left( {2a – b} \right)^5}\)
\( = C_5^0{\left( {2a} \right)^5} – C_5^1{\left( {2a} \right)^4}b + C_5^2{\left( {2a} \right )^3}{b^2} \ldots \)
Therefore the coefficient of the third term is equal to \(C_5^2.8 = 80\).
ADSENSE
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