The sum  is equal to
  • a)
    1
  • b)
    3/4
  • c)
    4/3
  • d)
    None of these
Correct answer is option 'B'. Can you explain this answer?

JEE Question

By Arjun Singh · Apr 22, 2020 ·JEE
9 Answers
Satyaveer Singh answered May 20, 2019
Answer is c

Nisha Sharma answered May 22, 2020
Answer is B(3/4)

Agam Gupta answered Jun 29, 2020
Expand r2-1=(r+1)(r-1)
then write numerator 1 as( r+1)-(r-1)
and multiply both numerator and denominator by 2

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