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Take any two consecutive 1 digit numbers in ascending order and club them. Multiply the clubbed number with 2 . Take the difference between the greatest and smallest consecutive number be * and when multiplied with 9 it becomes 9*. Now the sum of 2 times the clubbed number and 9* = sum of the clubbed number and its descending order

Example:-

numbers -: 3 and 4

clubbed to form :- 34

multiplied with 2 to form 68

difference between the greatest and smallest consecutive number :- 4-3 = 1

multiplying 1 with 9

adding 68 to 9 = 77

which is equal to

34 +43 = 77

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