I'm sorry, but without any information in the box, I cannot determine the number or the form of decay. Can you please provide more context or details?
To determine the missing number and the type of decay, we need more information. Please provide the relevant details or clarify your question further.
To answer your question accurately, I would need the missing information about the number in the box and the type of decay you are referring to. Please provide more details so I can assist you better.
