Discussion

Explanation:

Here 0 cannot come thousand’s place, hence

Number of ways of filling thousand’s place = 7 ways (digits 1 to 7)

Number of ways of filling hundred’s place = 7 ways (now digit 0 is also available)

Number of ways of filling ten’s place = 6 ways

Number of ways of filling unit’s place = 5 ways

∴ Total 4-digit numbers = 7 × 7 × 6 × 5 = 1470.

Hence, 1470.

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