AIEEE Exam Category

How many of the natural numbers from 1 to 1000 have none as their digits repeated?

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AIEEE Other Question

How many numbers lying between 100 & 1000 can be formed using the digits 2, 3, 0, 8, 9 (no digit being repeated). When a group photograph is taken, all the seven teachers should be in the first row and all the twenty students should be in the second row. If the two corners are reserved for two tallest students,interchangeable only between them and, if the middle seat of the front row is reseved for the Principal. How many arrangements are possible?