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

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Number System
Find the greatest number which divides 83, 125 and 209 leaving the same remainder in each case.

42
23
17
19

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Number System
The difference between a two-digit number and the number obtained by interchanging the digit is 36. What is the difference between the sum and the difference of the digits of the number if the ratio b

4
8
16
None of these

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