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(A) The given series is $AB, AB, CB, CB, CD, CD, ?$.Observe the pattern of the pairs:$1$. The first letter of the first pair is $A$.$2$. The first let

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$EF$

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(A) The given series is $AB, AB, CB, CB, CD, CD, ?$.Observe the pattern of the pairs:$1$. The first letter of the first pair is $A$.$2$. The first letter of the second pair is $C$.$3$. The first letter of the third pair is $E$.This shows the first letter follows the sequence $A, C, E, ...$ (skipping one letter).$4$. The second letter of each pair is the letter immediately following the first letter (e.g.,$AB, CD, EF$).Following this pattern,the next pair after $CD, CD$ should be $EF, EF$.However,looking at the sequence structure $AB, AB, CB, CB, CD, CD$,the pattern is actually pairs of letters where the first letter increases by $2$ $(A 	o C 	o E)$ and the second letter is the successor of the first. Thus,the next term is $EF$.

Which of the following will come in place of the question mark $(?)$ in the order given below?
$AB, AB, CB, CB, CD, CD, ?$

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Which of the following will come in place of the question mark $(?)$ in the order given below?$AB, AB, CB, CB, CD, CD, ?$