Number System
The sum of the digits of a two-digit number is 15 and the difference between the digits is 3. What is the two-digit number?

78
Cannot be determined
69
96

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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 ?

3186880
3286880
3386880
3086880

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