Question 35
MediumOriginal questionFind the next letter of the series B, C, E, G, K, ?
Show the answer and explanation
CorrectNot quiteAnswer B
Correct answer: B
Explanation
Positions: B = 2, C = 3, E = 5, G = 7, K = 11. These are the prime numbers.
The next prime is 13, which is M.
Worth noting
The jumps 1, 2, 2, 4 look irregular; that is the signal to write the positions and test primes. O (15) is odd but not prime.
- Concept
- Letter positions that are primes
- Typical timeTypical
- 70 s
- Your timeYours
- —
Practise this chapter →
Ten questions from Number and Letter Series, at your own pace.