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Solution
Three digit numbers from 75 to 405 will be from 100 to 404.
From 100 to 200, there will be 101 numbers.
From 201 to 300, there will be 100 numbers.
From 301 to 400, there will be 100 numbers.
From 401 to 404, there will be 4 numbers.
Therefore, Number of 3 digit whole numbers from 75 to 405 will be 101+100+100+4 = 305
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