Dd 2-digit numbers

Find all odd 2-digit natural numbers compiled from digits 1; 3; 4; 6; 8 if the digits are not repeated.

Correct result:

n =  8

Solution:

$$\begin{gathered} M=41;43;61;63;81;83;13;31 \\ n=3\cdot 2+2=8 \end{gathered}$$

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