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Which of the following letter-number clusters will replace the question mark (?) in the given series to make it logically complete? JCF25, KDG34, LEH43, MFI52, ?
NGI61
NGI60
NGJ60
NGJ61
NGJ61
Split the cluster into three parts: letters 1, letters 2, letters 3, and numbers. Add 1 to letters, add 1 to digits, and add 9 to numbers.
Split the cluster into three parts: letters 1, letters 2, letters 3, and numbers. Add 1 to letters, add 1 to digits, and add 9 to numbers.
Analyze 1st, 2nd, 3rd Letters
Each position in the letter cluster follows a +1 shift: J->K->L->M->N; C->D->E->F->G; F->G->H->I->J.
Analyze Numeric component
The number part follows an arithmetic progression with a common difference of +9: 25, 34, 43, 52. Applying this: 52 + 9 = 61.
Final Synthesis
Combining the letters N, G, J and the number 61 results in NGJ61.
A: Wrong 3rd letter (I) and wrong number (61). B: Wrong 3rd letter (I) and wrong number (60). C: Wrong number (60).
D is correct because each letter position increments by +1 and the number sequence increments by +9, resulting in NGJ61.
In alphanumeric series, always isolate the letters from numbers and solve them as separate sequences. If letters are close, check for simple positional shifts (+1, -1) first.
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