Probability/Combinations/Variations/Statistics

Question 1

Probability (A)

Answer 1

number of expected outcomes/number of all outcomes

Question 2

Probability (A and B)

Answer 2

P (A) x P (B)

Question 3

Probability (A or B)

Answer 3

P (A) + P (B) - if A and B CANNOT occur simultaneously
P (A) + P (B) - P (A and B) - if A and B CAN occur simultaneously

Question 4

Probability (not be A)

Answer 4

1 - P (A)

Question 5

Probability (at least be A)

Answer 5

1 - P (not be A) - not the same as the other formula

Question 6

Combination

Answer 6

without arrangement of elements

Question 7

Variation

Answer 7

with arrangement of elements

Question 8

Circular Variation

Answer 8

(n - 1)!

Question 9

Variation with Custom Repetition

Answer 9

leeds - 5!/1! x 2! x 1! x 1!

Question 10

Variation with Custom Grouping

Answer 10

Group