Let’s find the pattern in the sequence:
7, 15, 31, ?
Notice:
7×2+1=157 \times 2 + 1 = 157×2+1=15
15×2+1=3115 \times 2 + 1 = 3115×2+1=31
So, each term is (previous × 2) + 1.
Therefore,
31×2+1=6331 \times 2 + 1 = 6331×2+1=63
✅ The missing number is 63.
