23
                           
                           
                              
                           
                           
                           
                           
                                                      
                           
                  
                  
                  
                           
                                                                                 
                           
                              
                                                            
                                 
                                 
                                 
                              
                           
                           
                           
                           
                           
                        
                        
                     
                              Q:
                           
                           
                                                      | A) 45 min | B) 25 min | 
| C) 30 min | D) 36 min | 
                              Answer:   C) 30 min
                              
                                                            
                              
Explanation:
                               
                           
                           Explanation:
After 5 mins ..... 3 persons will get rumour
After 10 mins .... 3x2 + 3 = 9 =  persons will get 
after 15 =5x3 min ......9x2 + 9 =27 =  persons will get news.
.
.
after 5x6 mins ...  = 729 persons will get news.
Therefore, time taken to spread the rumour to 729 persons is 30 minutes.
                            
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