1003024606

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1003024606
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Each payment card has its numeric four-digit PIN code. How many different PIN codes can be selected, if only a code with different numbers may be used?
\( \frac{10!}{6!} = 5\:040 \)
\( \frac{10!}{4!} = 151\:200 \)
\( \frac{10!}{6!\cdot4!} = 210 \)
\( 10^4 = 10\:000 \)