4, 9, 17, 35, _, 139 complete series
Answer (1)
69.
The formula is to add +1 and next digit to _1.
For example, 4*2+1=9; 9*2-1=17
1 like
Comments (0)
Related Questions
ST:AB::YZ: ? complete the series
57 Views
COMPLETE THE SERIES :13 ,24,46,90,178.....
3089 Views





