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It is 15. Because in every variable, 3 is added. Thank You!!! ☺

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The choices is just 4 7 10 or 12 only....and explain too ty
Can i ask,,,,,,,,, the variables have not any in common and it just keep on adding and adding.
It was finished the teacher said it was 4 but idk whats the reason
I just hope this helps

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Can you explain it mrcreeper?
well i just added the last three numbers i know i'm wrong but i just did my best and try to understand problems such as these brain teaser that you are talking about
i'm so sorry
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