A combination circuit would be needed for security because if you had a strait circuit if any one of those sensors or the keypad was ripped off the circuit will now let the flow of electricity be possible but with a combination circuit it helps eliminate that problem because even if on flow path is cut off, other paths are still available <span />
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I think the answer would be 60x something but I'm not for sure
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Surface Laptop 3 - 15", Platinum (metal), AMD Ryzen 5 3580U, 8GB, 128GB
i need help on that too :cc