Ans: 252

Lets assume xxx are the 3 positions for digits,

If 4 is at the hundereds poisiton, then I can 10 different options for tenth position and 10 different option for unit position, which will give 10*10=100

Now say 4 is at Tens position, which will give 8 options for hunderds position(excluding 0 and 4, as 4 at hundereds is covered above) and 10 options for unit place, 8*10= 80

4 at units place, will give 8 options for hundereds place and 9 options for tens place(excluding 4 at tens place as it is covered above), which will give 8*9= 72

Hence total ways is 100+80+72= 252.

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