Question

Select the number from among the given options that can replace the question mark (?) in the following series. 1, 3, 7, 15, 31, 63, ?

A 143
B 126
C 127
D 131
Practice Next

Hey! Ask a query

🎓
Think You're Ready for RBI Grade B?
RBI Grade B 2026 Phase 1 Memory Based Paper
  • 200 Questions with Detailed Solutions
  • Section-wise Coverage (GA, English, Quant & Reasoning)