Polynomials

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Sum of a Series

    What is the sum of .... 19 terms or 7 + 13 + 21 + 31 + 43 + 57 + 73... 19 terms?
    1. 3100
    2. 3025
    3. 3044
    4. 3097

 

  • Correct Answer
    Choice D. 3097

Explanatory Answer

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Detailed Solution



So, the above expression becomes
(22 + 2 + 1) + (32 + 3 + 1) + (42 + 4 + 1) + ………. + (202 + 20 + 1)
Σn2 + Σn + Σ1 from 2 to 20
(for n = 20)
(for n = 20)


Answer choice (d)


Correct Answer: 19522.



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