1003024606 | math4u.vsb.cz

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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! \cdot 4!} = 210

10^{4} = 10 000