Question:
In the expansion \({\left( {{a^2} + \frac{1}{b}} \right)^7}\), the 5th term is:
Reference explanation:
Correct answer: A
The general term in the above expansion is
\({T_{k + 1}} = C_7^k. {a^{14 – 2k}}. {b^{ – k}}\)
So the 5th term is
\({T_5} = C_7^4. {a^6}. {b^{ – 4}} = 35. {a^6}. {b^{ – 4}}\).
ADSENSE
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