(Math Quiz 10 – CT) In the expansion ({left( {2a – 1} right)^6}), the sum of the first three terms is:

  • Question:

    In the expansion \({\left( {2a – 1} \right)^6}\), the sum of the first three terms is:

    Reference explanation:

    Correct Answer: EASY

    We have:

    {\left( {2a – 1} \right)^6}\\
    = C_6^0{.2^6}{a^6} – C_6^1{.2^5}{a^5} + C_6^2{.2^4}{a^4} – …

    So the sum of the first 3 terms is \(64{a^6} – 192{a^5} + 240{a^4}\).


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