Maths - permutations and combinations

how many four digit number are there between 3200 and 7300 in which 6 8 9 together or separately do not appear

And answer is 1077
Please explain in easy way

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asked by Vipul
  1. not too clear on the wording ...
    would 45637 be allowed, or do all of the 6 8 9 have to be excluded?

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    posted by Reiny

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