0
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18


12 34 56 78 910 1112 1314 1516 1718 1920 2122 2324 2526 2728 2930 3132 3334 3536

Each row forms a set which implements a pattern. The two patterns are similar but not essentially the same. However, one row contains an element that does not fit into the pattern. Find this element.

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  • 7
    $\begingroup$ You have posted several intriguing puzzles which do not seem to have any direction given or much commentary on answers. Apparently no-one can solve them correctly. Do they each have a definitive answer? $\endgroup$ – Weather Vane Sep 6 '19 at 21:08
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I think(partial):

2122


In the second row,
$1920$ can be expressed as $910 *2+100$.
$2324$ can be expressed as $1112*2+100$.
$2728$ can be expressed as $1314*2+100$... and so on
But $2122$ is the only number which cannot be expressed in that form.

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  • 1
    $\begingroup$ Then how about the first row? $\endgroup$ – athin Sep 7 '19 at 12:14
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In the second row you have paired two and two numbers. 910 is the only chunk where the two numbers paired does not have the same number of digits.

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