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Answer : 3 30 min Explanation : Answer: C) 30 min Explanation: After 5 mins ..... 3 persons will get rumourAfter 10 mins .... 3x2 3 = 9 = 32 persons will get after 15 =5x3 min ......9x2 9 =27 = 33 persons will get news...after 5x6 mins ... 36 = 729 persons will get news. Therefore, time taken to spread the rumour to 729 persons is 30 minutes.

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