How many ways can 4 boys and 3 girls sit in a row if all girls must sit together?

Question

Accepted Answer

(C) 1440. Explanation: Treat girls as one block: arrange 5 units in 5! = 120 ways. Girls arrange among themselves in 3! = 6 ways. Total = 120×6 = 720. Wait — 5 units (4 boys + 1 girl block) = 5! = 120, girls = 3! = 6. Total = 720. Answer B.