What is the number of even three digit numbers with 0,1,2,3,4,5? Do this kind of problem have what knack? Can say analytic process?

The method of permutation and combination is as follows:
Even numbers ending in 0: C (5,1) * C (4,1) = 5 * 4 = 20
Even numbers ending in 2: C (4,1) C (4,1) = 4 * 4 = 16
Even numbers ending in 4: C (4,1) C (4,1) = 4 * 4 = 16
Total: 20 + 16 + 16 = 52

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