# Thread: a box of paper

1. ## a box of paper

A box contains 25 slips of paper numbered 1 to 25. What is the probability that one will randomly select a number that is divisible by 3 or 7?
help me anybody.....
I'll be very appresiate you!

2. Originally Posted by busyboy
A box contains 25 slips of paper numbered 1 to 25. What is the probability that one will randomly select a number that is divisible by 3 or 7?
help me anybody.....
I'll be very appresiate you!
Write out all the numbers between 1 and 25 that are divisible by either 3 or 7. Count how many there are. Divide that number by 25. Viola!

3. Originally Posted by mr fantastic
Viola!

Jhevon made the same mistake !
It's voilą
Viol...means rape ! but don't worry, I would give my consent xD

4. Originally Posted by busyboy
A box contains 25 slips of paper numbered 1 to 25. What is the probability that one will randomly select a number that is divisible by 3 or 7?
help me anybody.....
I'll be very appresiate you!
A number divisible by 3 is = 3, 6, 9, 12, 15, 18, 21, 24
= total 8 numbers.

A number divisible by 7 is = 7, 14, 21
= total 3 numbers.

Probability that a number divisible by 3 or 7 is $\displaystyle = \frac {8+3}{25}$

$\displaystyle = \frac {11}{25}$

5. Originally Posted by Shyam
A number divisible by 3 is = 3, 6, 9, 12, 15, 18, 21, 24
= total 8 numbers.

A number divisible by 7 is = 7, 14, 21
= total 3 numbers.
Shyam, if you are going to simply handout complete solutions at least do them correctly.
Probability that a number divisible by 3 or 7 is $\displaystyle = \frac {8+3{\color{red}-1}}{25} = \frac {10}{25}$
You counted 21 twice.

6. Originally Posted by Moo

Jhevon made the same mistake !
It's voilą
Viol...means rape ! but don't worry, I would give my consent xD
The viola is my favourite instrument. I like to hear it sometimes when I post. Hence my deliberate transposition of letters. As for Jhevon, I think he's just lousy at French