We use cookies to personalise content and advertisements and to analyse access to our website. Furthermore, our partners for online advertising receive pseudonymised information about your use of our website. cookie policy and privacy policy.
 
+0  
 
0
119
2
avatar+814 

How many two-digit numbers have digits which add up to 7?

 

16

25

34

43

52

61

70

 

So, 7, right?

 Dec 4, 2018
 #1
avatar
0

That is what I get!.

 Dec 4, 2018
 #2
avatar+644 
0

We have eight pairs.

{0, 7} {1, 6}{2, 5} {3, 4} {4, 3} {5, 2} {6, 1} {7, 0}

However, {0, 7} doesn't work because 7 is just a one digit number, so we have \(8-1=7\) total possibilities. You were right!

 

You are very welcome!

:P

 Dec 5, 2018

4 Online Users

avatar