Question

15 coupons are numbered 1,2,3,...,15 respectively. 7 coupons are selected at random one at a time with replacement. The probability that largest number apperaing on a selected coupon is 9 is

Answer 1

@knov

Answer 2

can someone help me

Answer 3

what's your question ?

Answer 4

http://prntscr.com/aoxceb its right here i just need the steps im in 6th grade

Answer 5

I m not getting it ..
R u talking to me or Emon?

Answer 6

Im typing in your post. So im talking to you.

Answer 7

Great then bt why is he posting his question in my post?

Answer 8

You solve it.

Answer 9

i was just asking where i can find someone i didnt mean to be rude.

Answer 10

i have no idea.

Answer 11

Leave it..
My question is what is the probability that largest number appearing on the selected coupon comes out to be 9?

Answer 12

okay, so it's a combinatoric question.

Answer 13

Yep! You may call so

Answer 14

so we have 7 options to choose. Assume that first outcome is

Answer 15

and so on..

Answer 16

I found the total outcomes ..
That is 15^7

Answer 17

here we can say that the largest number here is 15.

Answer 18

We need to rule out this case for we need that 9 has to be the biggest number..

Answer 19

yes

Answer 20

there are 7 coupons we can choose from fifteen. how many numbers are less than 9 ?

Answer 21

8

Answer 22

can you found out the probability the first 6 coupons are less than 9 ?

Answer 23

Hey wait ...
Do u want to say that 9 has to occur on the last coupon??

Answer 24

no, it could occur on all coupons.

Answer 25

Hey wait ...
Do u want to say that 9 has to occur on the last coupon??

Answer 26

Bt u said that i need to find out the probability of first 6 coupons showing less than 9..

Answer 27

well, nvm. let's try out the other way. I found it more complicated.

Answer 28

Luks gud to me !

Answer 29

The new way !

Answer 30

let's assume that the all coupons are chosen from 1,2,3...9.

Answer 31

I also made this in my notebook just now!