A31
B17
C25
D27
Answer:
3 ×2+1 =7 7×2+1=15 15×2+1=31
Related Questions:
What would come at the place of question mark in the number series ?
2 , 10 , 30 , 68 , ?
വിട്ടുപോയ സംഖ്യ ഏത്?
511, 342, 215, —, 63