the sum of series represented as
1/(1*5) + 1/(5*9) + 1/(9*13) +..... + 1/(221*225) is Select.
A) 28/221 B) 56/221 C) 56/225 D) 54/225 E) none of these
1/(1*5) + 1/(5*9) + 1/(9*13) +..... + 1/(221*225)   =(1/4)*[(5-1)/(1*5) + (9-5)/(5*9) + (13-9)/(9*13) +..... + (225-221)/(221*225)]   =(1/4)*[(1- 1/5)+(1/5 - 1/9)+(1/9 -1/13)+...(1/221 -1/225)]   =(1/4)*(1- 1/225)   =(1/4)*(224/225)   =56/225   ANSWER:56/225
<result>C</result>
the sum of series represented as
1/(1*5) + 1/(5*9) + 1/(9*13) +..... + 1/(221*225) is