Q: 143 (IAS/1998)

The missing fraction in the series given below is : 4/9, 9/20, ....,39/86
question_subject: 
Logic/Reasoning
question_year: 
1998
question_exam: 
IAS
question_sub_subject: 
Reasoning
question_topic: 
Analytical
stats: 
0,104,184,48,104,120,16