اتمنى تساعدوني...أسئلة في الاحتمالات

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السلام عليكم لو سمحتوا اتمنى تساعدوني بحل هذي الاسئله

ولكم جزيل الشكر
exercise 1:
Acollege have 5 math section, if we distribute another 4 students to these section

1-find the probability that 2 of them moved to the same section and the other in different section?

exercise 2:
Box contains cards unmbered by
{1,2,3,4,5,6,7} if you select 3 cards at a time randomly

1- Find the probability that the sum of the numbers appcar is odd
2- if the numbers 4 appcar , find the probabitity that the sum of the numbers appcar is even.
3-Find the probability that one of the sclccted cards appcar number is 4 if you know that one of the sum of the numbers is even

exercise 3:
A,B are two iid events , and P(A1)=5P(A2) ,AC S.
P(A/A1)=0.2 ,P(A/A@)+0.3 what is the value of P (A1/A)?




بصراحه محتاجتهم مره ولاعرفت احلهم وياريت اللي بيحلهم يشرحهم والله يوفقه انشالله

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exercise 3:
A,B are two iid events , and P(A1)=5P(A2) ,AC S.
P(A/A1)=0.2 ,P(A/A2)+0.3 what is the value of P (A1/A)?<< بغيت اصححها

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ولا واحد يبي يساعدني؟؟؟