What is the value of the following expression?
(1/ (2^2 – 1)) + (1/ (4^2 – 1)) + (1/ (6^2 – 1)) + .... + (1/ (18^2 – 1))	Select the correct option:
A) a. 9/19  B) b. 10/19  C) c. 10/21  D) d. 11/21  E) e. 11/19
it can be written into   1/3+1/15+ 1/35.....1/323   i.e   1/3+1/2*(1/3-1/5)+1/2*(1/5-1/7).... til last term - 1/2*(1/19)   all terms from 1/5 .. to second last term get cancelled   left with   1/3+1/6-1/42=1/2-1/38=18/38=9/19   a. 9/19
<result>A</result>
What is the value of the following expression?
(1/ (2^2 – 1)) + (1/ (4^2 – 1)) + (1/ (6^2 – 1)) + .... + (1/ (18^2 – 1))