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I'm not familiar with "Lotto 556", but if it's meaning is the same as "Lotto 649" which I am familiar with, then it means that five unique numbers between 1 and 56 are picked. If that is correct, then the number of winning combinations are:

56! / 51!

Which equals:

56 * 55 * 54 * 53 * 52

or: 458377920

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12y ago

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