how many numbers are equal to the sum of two odd, one-digit numbers?

Question

anonymous · Answer

ok, the highest odd one digit number is nine. soo, the sum of those two would be 18

anonymous · Answer

I don't know what it means by "how many numbers are equal to"

anonymous · Answer

ok, thanks anyway, you have been a big help, i might need some more help soon if you dont might?

aum · Answer

One-digit odd numbers are: 1, 3, 5, 7, 9
There are 5 numbers total.
In how many ways can you pick 2 numbers out of 5?
$\large ^5C_2$ ways.

anonymous · Answer

thanks aum

aum · Answer

you are welcome.

aum · Answer

$\Large ^5C_2 = \frac{5!}{3!2!} = 10$

aum · Answer

1, 3, 5, 7, 9
You can do:
1 + 3
1 + 5
1 + 7
1 + 9

3 + 5
3 + 7
3 + 9

5 + 7
5 + 9

7 + 9

10 ways.

anonymous · Answer

if you type, @mkerr017 or @aum we get notified btw

anonymous · Answer

thanks!

anonymous · Answer

oh, sorry im new so, thanks @mkerr017

aum · Answer

If you found the answer you can close this question.

anonymous · Answer

yeah, no problem, i figured i should  just let you know:)

anonymous · Answer

ok thanks both of you!  @mkerr017  and @aum

aum · Answer

You are welcome.