Probability..

Tipsandtricks.

4 big ideas(question types)

1........ pathway problem.
- pascals triangle(be able to create it)

2.......... fundamental counting principle.
-nPr ------------------------------ math over 1 prb
(big #) order matters,
ex: books on a shelf in a different orders
: licence plates
: phone #
: locker combo
= n! / (n-r)!

-nCr
(small #) order doesnt matter,
n!/(n-r)!*r!
ex:
:pizza toppings
:committees

SHOW ALL WORK (sample space ... )

3..............INDEPENDENT / DEPENDENT
* denominator changes through the question chronologically

dependant >> without replacement
independent>> replacement

**consider tree diagram

4.............MUTUALLY INCLUSIVE vs MUTUALLY EXCLUSIVE

inclusive >> P(A or B) = P(A) + P(B) - P(A and B)
exlusive(they cant happen at the same time)>> P(A or B)=P(A)+P(B)




****COMPLEMEMTARY.. FORMULA.
P(not exactly 1 head)= 1-P(exactly one head)