COMBINATROICS: FUNDAMENTALS GRE QUANTS SRIJITA BANERJEE https://unacademy.com/user/mampi

Simple Concept . AND Multiply OR: Add These are mathematical objects with mathematical meaning 02

If at a dinner party, you get the option to choose between 1 of 3 veg starters OR 1 or 4 non-veg starters, how many choices do you have?? #lveg-starter #2veg-starter #3veg-starter #Inonveg-starter #2nonveg-starter #3nonveg-starter . #4nonveg-starter . . . 02

If at a dinner party, you get the option to choose between 1 of 3 veg starters and 1 or 4 non-veg starters, how many choices do you have?? . #lveg-starter 3 +4 7 #Zveg-starter #Sveg-starter . #1 nonveg-starter #2nonveg-starter . #3nonveg-starter . #4nonveg-starter . 02

If at a dinner party, you get the option to choose between 1 of 3 veg starters AND 1 or 4 non-veg starters, how many combinations do you have?? . #lveg-starter . #Zveg-starter . #3veg-starter #1 nonveg-starter #2nonveg-starter #3nonveg-starter #4nonveg-starter . . . . 02

If at a dinner party, you get the option to choose between 1 of 3 veg starters AND 1 or 4 non-veg starters, how many combinations do you have?? . #lveg-starter . #Zveg-starter . #3veg-starter #1 nonveg-starter #2nonveg-starter #3nonveg-starter #4nonveg-starter . . . . 3*4 12 02

One more parameter Listing of all the parameters gives faster results.

Fundamental Counting principle Suppose we divide the ways we can do our problem into stages . Stages: n1, n2, n3, n4 . Then, the total number of ways we can do it is going to be: N- (n1) (n2) (n3) (n4) 02

Suppose we have five seats for five girls, how many different ways can we seat them? 02

Suppose we have five seats for five girls, how many different ways can we seat them? First Girl: 5 02

6 lessons,

55m 10s

Enroll

23

✕Download

Srijita Banerjee

B.Tech in Biotechnology\singer\loves teaching\public speaker\peer educator\Bengali

Unacademy user

Aryaan Vaidya

5 months ago

very helpful videos. thanks for it

1

Reply