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How many #s are there btw 2000 and 9999 that

a. contain no repeating digits?

answer is 8x9x8x7 = 4032 ..right?

b. are even, if no repeition is allowed

from 0-9 there is 5 even #s

so its 7x8x7x5 = 1960 ? right?

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# Homework Help: Need help on this question

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