SOLUTION: If repitition is not allowed, how many 3-digit numbers can be formed from the digits 0,1,2,3,4,5 are less than 400?

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Question 896080: If repitition is not allowed, how many 3-digit numbers can be formed from the digits 0,1,2,3,4,5 are less than 400?
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
I'll assume that +0+ can't be the
leading digit
The total possible 3-digit numbers, no repetition, is
+5%2A5%2A4+=+100+
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The total possible 3-digit numbers, no repetition,
which are +400+ or greater is:
+2%2A5%2A4+=+40+
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So, The total possible 3-digit numbers, no repetition,
less than +400+ is +100+-+40+=+60+