Number System
A two-digit number is such that the product of the digits is 8. When 18 is added to the number, then the digits are reversed. The number is:

24
81
18
42

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Number System
There are seven boys and four girls in a row. In how many ways can they be seated in the row so that all the girls do not sit together ?

11! - 8! x 3!
11! - 8! x 4!
10! - 7! x 3!
11! - 7! x 4!

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