Number System
9 3/4 + 7 2/17 - 9 1/15 = ?

9 817/1020
9 719/1020
7 719/1020
7 817/1020

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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 ?

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

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