solve this number puzzle


You have 4 numbers - 6, 15, 28, 45. Your goal is to find the fifth in a row based on the sequence pattern. Are you able to solve this brain teaser?


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Brain teaser - Number And Math Puzzle - solve this number puzzle  - You have 4 numbers - 6, 15, 28, 45. Your goal is to find the fifth in a row based on the sequence pattern. Are you able to solve this brain teaser?




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nine
Correct answer is 66, because the sequence pattern is: 6+9=15 (add 9), 15+13=28 (add 9+4), 28+17=45 (add 9+4+4), 45+21=66 (add 9+4+4+4).



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