Number System
The sum of the digits of a two-digit number is 12, and the difference between the number and the number obtained by interchanging the two digits of the number is 18. Find the number.

75
12.5
50
25

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Number System
In how many different ways can 7 boys and 3 girls sit in a row such that all the three girls do not sit together ?

3286880
3086880
3186880
3386880

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