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 pattern is $^{1} a^{2} b,^{2} b^{1} a,^{1} a^{2} b^{3} c,^{3} c^{2} b^{1} a,^{1} a^{2} b^{3} c^{4} d,^{4} d^{3} c^{2} b^{1} a$ ., ......
$M i s s i n g l e t t e r s = d c b a$ .

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ab, ba, abc, cba, abcd, .....

The correct option is D dcbaThe pattern is1a2b,2b1a,1a2b3c,3c2b1a,1a2b3c4d,4d3c2b1a., ......Missingletters=dcba.

The correct option is D dcba
The pattern is $^{1} a^{2} b,^{2} b^{1} a,^{1} a^{2} b^{3} c,^{3} c^{2} b^{1} a,^{1} a^{2} b^{3} c^{4} d,^{4} d^{3} c^{2} b^{1} a$ ., ......
$M i s s i n g l e t t e r s = d c b a$ .