hard probability question.. help plz?

- anonymous

hard probability question.. help plz?

- Stacey Warren - Expert brainly.com

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- chestercat

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- anonymous

##### 1 Attachment

- anonymous

I dunno :S

- anonymous

\[4^{4} = 256\]

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## More answers

- anonymous

want me to explain?

- anonymous

@kevinkeegan Please do

- anonymous

okay you have 4 choices tiles to use WWW WWB WBWetc... each will take up 3 slots and you have 10 slots only so we use 3 diff groups( groups as in WWW= 1grp, WBW=1grp an so on) first, taking up 9 slots, so the probability of arranging the 3 grps = 4X4X4 ; now we left with 1 last slot for the single white tile; and we can put the white tiles @ 4 different places( trying drawing out): so that gives us extra 4 different combos and therefore, total probability= 4X4X4X4

- anonymous

|dw:1335113090901:dw| arrow point to last slot for single white tile

- ParthKohli

I know the answer. http://ptri1.tripod.com/ptreal1r.gif See this picture of a pascal's triangle. Now see the row 2 and sum all the numbers of row 2 You get 4! See the row 10 and get the sum of all the numbers in row 10. You get the answer!

- anonymous

one thing to note: question did not state if the tiles can be reused, if cannot reuse, answer is 4X3X2X4

- ParthKohli

Answer is 1024

- anonymous

what about Parthkohli's way ?

- anonymous

pascal triangle does not work here becasue the tiles are in groups of 3

- ParthKohli

The question is about 10*1

- anonymous

pls read the question again

- ParthKohli

The final line, see it.

- anonymous

is they want us to use the 4 combo of WWW WWB WBW BWW then im right

- anonymous

if*

- anonymous

Somebody please explain the question. It is confusing

- anonymous

they want u to use the combos to fill up the 10 slots

- ParthKohli

They're asking us the different colour patterns in a ten by one rectangle. There are 1024 such patterns. Try it on your own.

- ParthKohli

They're asking us about the number of patterns possible in this case.

- anonymous

last line : "using THESE TILES " and i suppose THESE TILES refer to the 4 different colour patterns

- anonymous

the tiles are not individual they come in sets

- ParthKohli

All right. You're right, I'm wrong. Okay?

- anonymous

|dw:1335113911913:dw|

- anonymous

@kevinkeegan, 'these tiles' actually refer to the 3 tiles in the picture

- anonymous

yep and the 3 tiles form the 4 colour patterns they giv WWW WBW BWW WWB

- PaxPolaris

- anonymous

hey i think the ans is 385 plz check

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