Aclass has 20 students. if the teacher is randomly selecting a group of 3 students to represent the class on the student council, what is the probability that sarah and her two best friends will all be chosen? 1/20 3/20 1/1,140 ps answer

3/20

Step-by-step explanation:

The prbability space is 20 in this case

P(S)=20

The probability of selecting a student is 1/20

For  selecting 3 students, the probability will be;

1/20 +1/20 +1/20 = 3/20

the correct option is 2.

step-by-step explanation:

according to the given information triangle abc is a right angle triangle with right angle at a. segment ab is 5 and segment ac is 7. point d is on segment bc and angles adb and adc are right angles.

it is given that triangles abd, cad, and cba are similar.

two triangles are similar if their corresponding sides are proportional.

in triangle cba, using pythagoras theorem

                      )

triangle abd and cba are similar,

                            (2)

triangle cad and cba are similar,

                      )

using (1), (2) and (3), we get

hence proved.

therefore option 2 is correct.