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Q: It takes five minutes to pass a rumour from one person to two other persons. The tree of rumour continues. Find how many minutes does it take spread the rumour to 729 persons ?

  • 1
    45 min
  • 2
    25 min
  • 3
    30 min
  • 4
    36 min
  • Show Answer
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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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