Between 4000 to 5000, choose unit digit in 4 ways (0,2,61 8)-4 Choose tenth place of remaining 8 numbers = 8 (because 2 even number out of 10 numbers are already taken) Choose hundred piace by remaining 7 numbers - 7 ways Total number ways between 4000 to 5000 = 4x8x7 = 224 Similarly, for 5000 to 6000, Unit digit is chosen in 5 ways (0,2, 6 8 4)= 5 Tenth digit is chosen in 8 ways = 8 Thousandth digit is chosen by remaining 7 numbers = 7 ways Total number ways = 5x8x7 =280 Similarly, for 6000 to 7000 Total number ways 4x8x7= 224 Hence, total number ways for 4000 to 7000 = 224 + 280 + 224 = 728