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Lucky 7 Lottery tickets have a sequence of 7 digits, allowing for repeats. low many tickets are possible? How many tickets are possible without repeats?

Lucky 7 Lottery tickets have a sequence of 7 digits, allowing for repeats.

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low many tickets are possible? How many tickets are possible without repeats? How many tickets are possible such that no two adjacent digits are the same? How many tickets are there that either begin with 1-2-3 or 7-6

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