Madhu Asked a Question
April 17, 2020 8:46 ampts 30 pts
where all do we apply like this...why we have used this method putting all 2 power n
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  • Vivek kumar
    convergent
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  • Arzoo thankyou
    Do you get it?
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    Madhu
    s....
  • Arzoo
    I suggest you to see first check if series is geometric and if yes then then apply geometric test and if not then go for other test.Or when they ask about exact sum of series then ...
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  • Arzoo
    Because if series is geometric then we are able to find sum also whereas other tests just tell us about convergence and divergence but not exactly sum.
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  • Madhu
    then why do we use geometric series to get the answer
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  • Arzoo
    Madhu you should not get confused with geometric test and ratio test. sometimes ratio test can be applied to questions whereas geometric can't.
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  • Arzoo
    Whenever there is a polynomial or factorial then this ratio test should be apply until it get failed. Whenever exponential type of coefficients then apply nth root test
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    Madhu
    why are we comparing with geometric series to get these answers
  • Ujjawal vishal
    option a. see attachment
    • images.png
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    Madhu
    then it is equal to infinity...then it is greater than 1..then how is it convergent