Respuesta :

its will be 50 pairs
starting with 0+99=99 1+98=99
2+97=99 and so on
memo213le1

0+ 99 = 99

1 + 98 = 99

2 + 97 = 99

3 + 96 = 99

4 + 95 = 99

5 + 94 = 99

6 + 93 = 99

7 + 92 = 99

8 + 91 = 99

9 + 90 = 99

10 + 89 = 99

Here are most of the pairs I could think of. 50 pairs is your answer.  :)