So I saw this in a youtube reel, spent about 5 seconds then decided to just take the question to ChatGPT. Got a very interesting answer that sounds right. Curious what people here come up with.

Also an interesting thought on our future. Using your brain is going to be like going to the gym. Good for you, extremely healthy (and needed for quality of life) but not necessary for survival anymore. Given the obesity epidemic it's interesting to think about.

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one of the options is 5, explanation:

X OP 3 = Y

(the minus sign denotes a special operation "OP")

OP changes meaning based on the divisibility by 2
1) if X is odd, then X OP 3 = X - 3 - 2 (15 - 3 - 2 = 10, 13 - 3 - 2 = 8)
2) if X is even, then X OP 3 = X - 3 - 4  (14 - 3 - 4 = 7, 12 - 3 - 4 = 5)

I also got 5, but only because the pattern of the other subtractions was -2, -4, -2. Next one in the range is -4