Saturday

April 19, 2014

April 19, 2014

Posted by **Ana** on Thursday, January 28, 2010 at 10:53pm.

First Card

1 2 3 4 5 6 7 8 9 10

s 1

e 2

c 3

o 4

n 5

d 6

c 7

a 8

r 9

d 10

- Mathematicas -
**Reiny**, Thursday, January 28, 2010 at 11:19pmthere are 8 ways to get a sum of 9

1 8, 2 7, .... , 8,1

let's look at the prob of getting one of those pairs, the 1 8

prob of getting the 1 is 1/10.

since you are replacing the card, the prob of getting an 8 on the second draw is also 1/10

so the prob of getting the 1 8 combination is (1/10)(1/10) = 1/100

but there are 8 of those cases

so the prob of getting a sum of 9 when drawing 2 cards with replacement is 8/100 = 2/25

I want to play this game!

- Mathematicas -
**john**, Wednesday, December 21, 2011 at 11:46am2/25

**Related Questions**

math - To win $1 million, you must draw two cards whose sum is nine, from a ...

math - To win $1 million, you must draw two cards whose sum is nine from a stack...

4 grade - To win $1 million, you must draw two cards whose sum is nine from a ...

Math - To win one million dollars, you must draw two cards whose sum is nine, ...

math 4th grade - To win $1 million, you must draw two cards whose sum is nine, ...

math - to win 1 million dollars,you must draw two cards whose sum is 9 , from a ...

math - I MUST DRAW TWO CARDS WHOSE SUM IS NINE, FROM A STACK OF CARDS NUMBERED ...

Maths - Five red cards numbered 1,2,3,4,5 and two black cards both numbered 5 ...

Please help! im so confused! - You draw two cards from a well-shuffled deck of ...

Math - Five red cards numbered 1,2,3,4,5 and two black cards both numbered 5 are...