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On dialling certain telephone numbers, assume that on an average, one telephone number out of five is busy, ten telephone numbers are randomly selected and dialled. Find the probability that at least
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Stationary Push-button Telephone Top View Stock Illustration - Illustration of electronics, connection: 51633877
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LBBZJM Telephone number for home house phones Wall-mounted Corded Telephone, Small To Bring ,Caller ID Display/Large Button Phones For Seniors, Office/Home Landline Fixed Phone (Color : White) : Amazon.co.uk: Electronics & Photo
![Ornin T102 Trimline Corded Telephone, Wall mountable, Last Number Redial, Mute, M1/M2 One Touch Memory, Ringer Volume Adjustable(White)-UK Version: Amazon.co.uk: Electronics & Photo Ornin T102 Trimline Corded Telephone, Wall mountable, Last Number Redial, Mute, M1/M2 One Touch Memory, Ringer Volume Adjustable(White)-UK Version: Amazon.co.uk: Electronics & Photo](https://m.media-amazon.com/images/I/61ASVhgRLAL._AC_SL1500_.jpg)