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What number should replace the question mark? 12 - - - 25; 5 - - - 11; 21 - - - 43; 18 - - - 37; 2 - - - ?

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What number should replace the question mark?

12 - - - 25

5 - - - 11

21 - - - 43

18 - - - 37

2 - - - ?

posted Feb 21 by Vikram Luthra

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1 Answer

0 votes

5


12 x 2 + 1 = 25
5 x 2 + 1 = 11
21 x 2 + 1 = 43
18 x 2 + 1 = 37
2 x 2 + 1 = 5

answer Feb 21 by Hanifa Mammadov
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