CA Foundation · Quantitative Aptitude · Number Series, Coding-Decoding and Odd Man Out
One term is wrong in the series 1, 4, 9, 16, 26, 36, 49. Which is the wrong term, and what should replace it?
The series is the squares of natural numbers 1 to 7. The fifth term should be 5 squared, which is 25, but the series shows 26. So 26 is the wrong term and should be replaced by 25.
- A16 should be 25
- B26 should be 25Correct
- C36 should be 35
- D9 should be 8
Explanation
The series is of perfect squares: 1², 2², 3², 4², 5², 6², 7². The fifth term should be 5² = 25, but 26 is given. All other terms are correct squares, so 16 and 36 are fine.
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 language, each letter of a word is replaced by the letter that is its mirror position in the alphabet (A becomes Z, B beco…
- Three of the following numbers share a common property. Pick the odd one out: 29, 37, 49, 53
- Find the missing group in the series: ACE, GIK, MOQ, ?
- Find the next term in the letter series: Z, X, U, Q, ?
- Find the odd one out: ACE, FHJ, KMO, PRU
- Find the odd one out: 3, 5, 11, 17, 21, 29.