Find the missing letter.
ab, ba, abc, cba, abcd, .....

acbd

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bacd

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cabd

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dcba

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Solution

The correct option is D dcba
The sequence starts with 2elements in the set which will be written in the reverse order in the succeeding place,and an element get added in the next term which comes in the order of alphabets.
$a b \to b a$
$a b c \to c b a$
$a b c d \to d c b a$

The next term in the sequence will be $d c b a$ (the preceeding term will get reversed)

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Find the missing letter.ab, ba, abc, cba, abcd, .....

Find the missing letter.
ab, ba, abc, cba, abcd, .....