10, 20, 19, 38, ? | Double Rule Pattern 😱 #maths #braintestsolution

10, 20, 19, 38, ?

This one alternates two rules:
×2, then −1, then ×2, then −1...

10 × 2 = 20
20 − 1 = 19
19 × 2 = 38
38 − 1 = 37

Answer: 37

Most people see ×2 and keep doubling. The −1 is the trap.
Comment 37 if you spotted both moves 👇

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Видео 10, 20, 19, 38, ? | Double Rule Pattern 😱 #maths #braintestsolution канала One % IQ