Multiple Choice Questions on If 1 3 2 32 3 33 n 3n 2n minus 1 3a b 4 then a and b are respectively ........ for NDA Exam Preparation

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Multiple Choice Questions

If 1 3 2 32 3 33 n 3n 2n minus 1 3a b 4 then a and b are respectively ........

Mathematics (NDA) Arithmetic progression
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    If 1.3 + 2. 32 + 3. 33 +.... +n. 3n = (2n−1)3a+b / 4 then a and b are respectively-

    n , 2

    Incorrect Answer

    n , 3

    Incorrect Answer

    n + 1 , 2

    Incorrect Answer

    n + 1 , 3

    Correct Answer
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    Explanation:

    1.3 +2.32 + 3.33 +……..+ n.3n 

    Sn = (2n−1)3n+1+3 / 4

    Comparing with, (2n−1)3a+b / 4

    a = n+1, b = 3 

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