$1, 2, 4, 6, 8, 9$ transformed into another
series whose mean is $12$ . Two middle terms of the transformed
series are

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11,13

10,14

9,15

7,8

answer is D.

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Detailed Solution

Mean of the given series is $5 .$ If we have to
transfer the given series into one having $12$ as mean, we
must take $d = x + 7 .$ The transformed terms are $8, 9, 11, 13, 15, 16 .$ The two middle terms are $11, 13 .$

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