Question 770104
how many different odd number of four digits can be formed with the digits 1,2,3,4,5,6,7.the digits in any number being all different?



Work:

the last number can be 1,3,5 or 7

And the first 3 numbers can be selected in 6P3 = 120 ways

So the answer is 120*7 = 840

Answer: 840

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