For 3-digit even numbers, the unit’s place can be occupied by one of the 3 digits 2, 4 or 6. The remaining 5 digits can be arranged in the remaining 2 places in 5P2 ways
∴ By the multiplication rule, the required number of 3-digit even numbers is 3 × 5P2 = 3 × 5 × 4 = 60.