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110.


All the 500s start with a 5 so that is 100 numbers that start (or end) with a 5.
Of the 400s, only those which ends with a 5 will do which are 405, 451, ..., 495. ie once for each possible tens digit; the tens digit can be one of 0, 1, ..., 9, ie one of 10 values, so there are a further 10 numbers that (start or) end with a 5.

making 100 + 10 = 110 numbers in all.

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Q: How many Nos bitween 400 and 600 begin with or end with digit 5?
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