12345, any combination of three numbers * * is c (5,3) = 5 * 4 * 3/(3 * 2) =10.

The combination with 5 means that 5 is needed, and the remaining 2 numbers are selected from 1234, and c (4 4,2) = 4 * 3/2 = 6.

Probability: 6/ 10=60%

Or, instead of the combination of 5, choose 3 numbers from 1234: c (4,3) = c (4, 1) = 4.

Probability: (10-4)/ 10=60%