Question

Insert the missing number:
265, 598, 81211,
125, 569, 91013,
215, 7611, _____

Answer is 121116.Can anyone explain how it came xP .

Please don't post random answers because I'm tired of it and miss the chance to get answers from sincere people .
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Answer 1

well you see in first row..

see the number

265, 598, 81211

now see

first digits of numbers

2,

2+3 = 5

5+3 = 8

that is first digits of 3 numbers 2,5,8

and second digit

6,

6+3 = 9

9+3 =12..

that is 6, 9,12