CA Foundation · Quantitative Aptitude · Number Series, Coding-Decoding and Odd Man Out
Find the next term in the series: 5, 11, 23, 47, ?
The series follows the rule of doubling the previous term and adding one. So 5 gives 11, 11 gives 23, 23 gives 47, and 47 gives 95. Hence the missing term is 95, because 2 × 47 + 1 equals 95 and not 94, which would come from only doubling.
- A94
- B95Correct
- C93
- D96
Explanation
Each term is obtained by doubling the previous term and adding 1: 5×2+1=11, 11×2+1=23, 23×2+1=47. So the next term is 47×2+1=95. Option 94 results from only doubling 47 and forgetting to add 1.
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