Number System
What value should come in place of ? in the given number series ? 15, 51, 162, 498, 1509, ?

7878
3434
5656
4545

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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
3386880
3286880
3086880

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