2A, 3C, 5F, 7J, 11O, ?
Analyzing the Series Pattern
The given series is: 2A, 3C, 5F, 7J, 11O, ?
We need to find the pattern governing both the numbers and the letters.
Number Sequence Logic
The numbers in the series are $2, 3, 5, 7, 11$.
- These numbers represent the sequence of prime numbers.
- The next prime number following $11$ is $13$.
Letter Sequence Logic
The letters in the series are A, C, F, J, O.
Consider their positions in the English alphabet:
- A = $1^{st}$
- C = $3^{rd}$
- F = $6^{th}$
- J = $10^{th}$
- O = $15^{th}$
Calculate the difference between consecutive positions:
- Position of C ($3$) - Position of A ($1$) = $2$
- Position of F ($6$) - Position of C ($3$) = $3$
- Position of J ($10$) - Position of F ($6$) = $4$
- Position of O ($15$) - Position of J ($10$) = $5$
The difference between the positions increases by $1$ each time ($+2, +3, +4, +5$).
The next difference in the sequence should be $6$.
Therefore, the position of the next letter is the position of O ($15$) plus $6$:
$15 + 6 = 21$
The $21^{st}$ letter of the alphabet is U.
Identifying the Next Term
Combining the next number ($13$) and the next letter ($U$), the missing term in the series is 13U.
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Important Questions from Alpha-numeric series
Consider the following sequence of numbers: 5 1 4 7 3 9 8 5 7 2 6 3 1 5 8 6 3 8 5 2 2 4 3 4 9 6 How many odd numbers are followed by the odd number in the above sequence?
Which one set of letters when sequentially placed at the gaps in the given letter series shall complete it? _sr_tr_srs_r_srst_
Find the missing number in the following series: 43, 172, 86, 344, ?
Select the missing numbers from the given alternatives
How many such pairs of letters are there in the word JOURNEY (in forward direction), each of which has as many letter in the same sequence between them in the word as in the English alphabet?
