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The number of different 7 digit plates that can be formed where the digits are not

repeated and no zero appears as the first digit is: 544 320.

Calculation:

Number of different plates = 9 [9P6] = 9 [9!/(9-6)!] = 9x9x8x7x6x5x4 = 544 320.

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Q: How many different license plates can be formed if each one consists of 7 digit number and each number can occur once and the first number can't be a zero?
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