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

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Number System
The difference between a two-digit number and the number obtained after interchanging its two digits is 36. The sum of the two digits of the number is 12. Find the lowest such possible number.

50
48
47
49

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