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`(186)/(190)``(187)/(190)``(188)/(190)``(18)/(.^(20)C_(3))`

Answer :

BSolution :

(b) Since, the set of three consecutive numbers from 1 to 20 are 123, 234, 345,…..,18, 19, 20 i.e., 18. <br> `"P(numbers are consecutive)"=(18)/(.^(20)C_(3))=(18)/(1140)=(3)/(190)` <br> `"P(three numbers are not consecutive)"=1-(3)/(190)=(187)/(190)`Transcript

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00:00 - 00:59 | highwayman 10 questions given three numbers are chosen from 1 to 20 find the probability that they are on the retina solution part solution it ask their consecutive how we can 23 number so we can together 1 2 3 2 3 4 3 4 5 456 into an update the last number will be 18 19 20 how many total terms are there in we are starting from one year 18 April total 18 Tum required Robin bility 18 upon now total number will be there any three numbers out of 2023 and we know that nothing but NTR |

01:00 - 01:59 | NCR formula Vinod n factorial upon pectoral into a minor Arc tutorial 1820 factorial upon 17 factorial into a factorial we get 18 and 27 3 into 3 factorial 25 what is 18 to 30 this is nothing but it in pictorial mujhe bhi connected 18 factorial in 23 factory respect and 25 can be written as 22192 18 factory this get cancelled out pic 23 time and 210 3 upon 19119 and thank you bhai |

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**Random or probabilistic experiments**

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**Algebra of events**

**negation of an event verbal description and equivalent set theoretic notation**

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