Hello everyone!
You have 9 cards with the one of the numbers 1-9 written on each and they are shuffled, you pick a card and write down the number and this is the tens digit of a 2-digit number, then you put the card back. You pick another card and this number is the units digit. so you might have a number like 27 if you pik a 2 then a 7.
1. what's the probability of getting a number under 20?
2. whats teh probability of getting a 14?
thank you for reading my post
Hello, Sweeties!
You have 9 cards with the one of the numbers 1-9 written on each.
They are shuffled, you pick a card and write down the number
. . This is the tens-digit of a two-digit number.
You replace the card and pick another card.
. . This is the units-digit of the two-digit number.
1. What's the probability of getting a number under 20?
2. What's the probability of getting a 14?
You can pick any of 9 numbers for the tens-digit.
You can pick any of 9 numbers for the units-digit.
. . There are: . possible two-digit numbers.
How many are under 20?
. . Well, there is: .
Get the idea?