Anything that is neither consumed nor broken by being used.
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A perpetual calendar is the type of calendar that can be adjusted for any year. This type of calendar can be reused each year.
Many can be washed and reused, and washed again. When they become discolored or crack I pitch them into the recycle bin.
Primary data is the the data that collected by yourself. While secondary data is those collected by others and to be reused by yourself.
It depends on how the game is structured, a piece of information that was not given in the answer... If the numbers are reused, then there are 1 x 107 (ten billion, in the short scale) permutations. Without combinations, then, the probability is 1 x 10-7. If the numbers are not reused, and we are playing combinatorial, in the style of most state sponsored lotteries, then the number of combinations is (10-3)! / 7!, which is 120, making the probability 1 in 120, or about 0.00833. There are other possibilities but, again, it depends on the rules, and you did not specify them completely.
Disposable PPE is supposed to be used only once. Even if you decontaminate it, it can fail in other ways such as seals being distorted or broken. One should always follow manufacturers directions regarding reuse.