Find the number puzzle

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Find the number puzzle

Find the number that will replace question mark

Find the number that will replace the Question mark

In the image you can see some random number series.
But there is a pattern to the numbers.
Can you identify the pattern and
find the number that will replace the question mark symbol ?

Hint : the number 7 at the end is not wrong, it is correct.

Click here for Answer

Answer : 12

Explanation:
27 and 45 point towards 18.
2+7+4+5 = 18
Similarly 21 and 36 will make
2+1+3+6 = 12
Hence 12 will replace question mark.