1.

How Many No Between 1000 To 9900 In Which Four Digits Of Number Are Different?

Answer»

Number of 4 DIGIT NUMBERS having all different digits = 9*9*8*7 = 4536 

smallest number : 1234, largest number : 9876, all are between 1000 and 9900.

Number of 4 digit numbers having all different digits = 9*9*8*7 = 4536 

smallest number : 1234, largest number : 9876, all are between 1000 and 9900.



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