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Four generations (Posted on 2020-07-06) Difficulty: 3 of 5
Let S be a set of all six-digit integers.

Let S1 be a subset of S, including all members of S such that each consists
of distinct digits.
Let S2 be a subset of S1, including all members of S1 each with 5 being the difference between its largest digit and its lowest one.
Let S3 be a subset of S2, comprising all elements of S2 divisible by 143.

What is the cardinality of S3 ?

Explain your way of reasoning.

No Solution Yet Submitted by Ady TZIDON    
Rating: 3.0000 (1 votes)

Comments: ( Back to comment list | You must be logged in to post comments.)
Solution apologies to steven | Comment 4 of 9 |
(In reply to re: part 1 via computer by Charlie)

I neglected to check for duplicate digits.

Corrected section of code:

    If highest - lowest = 5 Then
      good = 1
      For i = 2 To Len(ns)
        If InStr(ns, Mid(ns, i, 1)) < i Then good = 0
      If good Then ct = ct + 1: lastmemb = n: Text1.Text = Text1.Text & n & " "
    End If

with this it finds no solutions so the cardinality is zero.

  Posted by Charlie on 2020-07-06 10:34:16
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