Question

The number of 4 digits numbers that can be
formed from the digits 0, 1, 2, 3, 4, 5, 6, 7 so
that each number contain digit 1 is
1225
1252
1522
750​

Answer 1

Answer:

4! =7×6×5=210 . Therefore, the total number of 4 digit numbers that can be formed from the digits 0, 1, 2, 3, 4, 5, 6, 7 so that each number contains digit 1 is 840−210=630 .

Step-by-step explanation:

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Answer 2

Answer:

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