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EI Howmany pokerhands are full housei.e 3 of one kind 2 ofanother e.g
3 kings too 7 s
Nole the kings and the 7 s play differentroles thekings are
what we have two of
To put anotherway 3kings two sevens is differentfromthreesevens
2 kings
Stept decide whichof the 13denominationsyouhave 3of andwhich
you have 2 oforder is important
13 12
have3of have2ofP 13,2 ways for step1
Step decide which 3 and which 2 order is not important1
CC4,37 44,2
aus P 13,2 CC4,3 4,2 3744
Ey Howmanypolarhands contain two pairs e.g KO KB 7 753 8D
fromdifferentdenominationsC 13,2 cc4,2 CC4 2 a 444 1
fix Redothegridexample
A
BHowmany paths go from A to B movingonlyR or D
9 blocks exactly 4 ofwhich are D
Choose which 4 of 9 are D andthen therest are R
91 49.41 41 itfix A clubhas 5 men 6 women they have to choosepres VPtreasurer
a In howmanyways can theymakethesechoicesi i e i if at least oneofthethreebhas to be a woman
and11 to 9 P 11 3al
all menpres VP treas
b p 11,3 P 5,3 PCT31 5 4 3pres UP treas
I e insteadofdoing it directly verycomplicated
we throw out fromthe PC 3 those which
doit satify the condition PCs31
EI Themathclubhas 10members
chess 8
juggling 12
No one belongs to more than one club total of 30people
Theuniversity wants to send 3 clubmembers to a convention
In howmanyways can theychoosethe3 if
it doesn'tmatterwhatclubthey belongto CC30,31
b it has tobe one fromeach club 4191 c 8,1 CCR i
El all 3 have to befromthe sameclub Clio3 t 48 3 t c CR3
d not all can be from thesame club
aus to Cal fans to Cal CC30,3 ch93 cc8,3 Ccr 31
An urn contains 8 greenballs are 6 blueballs distinguishable
You choose 5 In howmany ways can youchoosethe 5 so that there
are more green balls than blue ones
G Bi 5 O C 8,5 46,04 I C 8,4 46,13 2 ace3 age
add these three
Howmany poker hands consistofa 9 lo J Q K of the same suit
b 9 co J Q K of positslydifferentsuits
cat 45
s 4 4 4 4 4 4q is J Q K
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