Three Integers are randomly chosen without replacement from to first 20 postive integer. Find the problality that this 3 intgless from an A.P
Probability of occurrence of an event -
Let S be the sample space then the probability of occurrence of an event E is denoted by P(E) and it is defined as
- wherein
Where n repeated experiment and E occurs r times.
Total Sum A.P series is
and 3 number are chosen from
20 number is
Required Probability =
Option 1)
Option is incorrect
Option 2)
Option is incorrect
Option 3)
Option is correct
Option 4)
Option is incorrect