Question

How many 3 digits number are there such that their digits are not in an arithmatic progression with positive difference?

Answer 1

Step-by-step explanation:

ANSWER

The only three digit numbers with all different digits whose digits are

in GP that we can subtract 400 from and get a positive number

are:

421,842,931

421−400=21, not a three-digit number, so 421 is out

842−400=442, 4,4,2 are not in AP, so 842 is out

931−400=531, 5,3,1 are in AP with common difference -2.  

So the number is  931

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