Medium
Directions: In each question there is a number series with one term missing shown by question mark (?). This term is one of the alternatives among four numbers given under it. That number is –
6, 13, 25, 51, 101, (?)
Explanation
Explanation
Step 1: Observe the pattern
Let's check each step.
- 6×2+1=13
- 13×2−1=25
- 25×2+1=51
51×2−1=101
Notice the alternating pattern:
- ×2 +1
- ×2 −1
- ×2 +1
×2 −1
Therefore, the next step should be:
101×2+1=202+1=203
PRO TIP
Re-check your working by substituting the answer back into the original question.