CA Foundation · Quantitative Aptitude · Number Series, Coding-Decoding and Odd Man Out
In the series 3, 8, 15, 24, 35, 48, ?, the differences between consecutive terms form a pattern. What is the missing term?
The differences between terms rise by 2 each time: 5, 7, 9, 11, 13, then 15. Adding 15 to 48 gives 63. This also matches the pattern n squared minus 1, where 8 squared minus 1 equals 63.
- A61
- B63Correct
- C64
- D62
Explanation
Differences are 5, 7, 9, 11, 13, so the next difference is 15. The missing term is 48 + 15 = 63. Also, the terms are n²−1 for n = 2, 3, ..., and 8² − 1 = 63. The option 61 comes from adding 13 again.
Did you get it right without looking?
One question tells you little. A timed set on Number Series, Coding-Decoding and Odd Man Out shows your real accuracy, how long you take and where you lose marks.
More Number Series, Coding-Decoding and Odd Man Out questions
- In a certain code, each letter is replaced by its opposite letter in the alphabet (A↔Z, B↔Y, C↔X, and so on). How will the word TRADE be wri…
- In the series 2, 3, 5, 9, 17, 34, 65, one term does not fit the pattern where the difference doubles each time. Which term is wrong?
- In a certain code, CAT is written as 3-1-20 and DOG is written as 4-15-7. Using the same rule, what is the code for the word FISH?
- Find the next term in the series: 2, 5, 10, 17, 26, ?
- Find the missing group in the series: CAT, FDW, IGZ, ?
- One term is wrong in the series 1, 4, 9, 16, 26, 36, 49. Which is the wrong term, and what should replace it?