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Find the number of ways of seating 10 st...

Find the number of ways of seating 10 students `A_(1), A_(2)…..A_(10)` in a row such that (i) `A_(1), A_(2), A_(3)` sit together (ii) `A_(1), A_(2), A_(3)` sit in a specified order (iii) `A_(1), A_(2),A_(3)` sit together ina specified order.

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