Probability Formulas

Question 1

Theoretical formula

Answer 1

P=favorable outcomes/total outcomes

Question 2

Complement of event

Answer 2

P(Ā)=1-p(A)

Question 3

Area

Answer 3

P=area of desired outcome/area of entire

Question 4

Experimental

Answer 4

P=success/trials

Question 5

Independent events

Answer 5

P(A&B)=p(A)•p(B)

Question 6

Dependent

Answer 6

P(A&B)=p(A)•p(B|A)

Question 7

Conditional

Answer 7

P(B|A)=p(A&B)/p(A)

Question 8

Overlapping

Answer 8

P(A or B)=p(A) +p(B)-p(A & B)

Question 9

Disjoint

Answer 9

P(A or B)=p(A) +p(B)

Question 10

Permutations

Answer 10

nPr
n=total
r=ways

Question 11

Combinations

Answer 11

nPr
n=total
r=scelection