Number System
The population of a town increases by 15% in the first year and decreases by 25% in the second year. If its current population is 168480 then what will be its population after two years ?

145314
145914
145214
145714

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

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