document.write( "Question 1014276: one bank machine has four rows of buttons like
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Algebra.Com's Answer #630621 by richard1234(7193) $\"\"$ $\"About$

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The four digits must be distinct. Without regards to order, we have 3*3*3*1 = 27 ways to choose 4 digits. Then we can permute the four digits 4! = 24 ways. So 27*24 = 648 ways. \n" ); document.write( "

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