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Q: How many four-digit numbers can be formed if the leading digit cannot be zero?

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100000 - including numbers with leading 0s

Assuming that numbers with a leading zero is not permitted, the answer is 9*9! = 3,265,920. If leading 0s were permitted, the answer would have been 3,628,800

You can not add two positive prime numbers and get zero.

Assuming leading zeros are not permitted, then: If repeats are not allowed there are 30 possible numbers. If repeats are allowed there are 60 possible numbers.

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A product cannot exist of a single number - a product is formed by multiplying two separate numbers.

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It is 120 if the digits cannot be repeated.

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9,000,000 if there are no other requirements.

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