1.

Two digit natural no. such that sum of its digits is 9

Answer»

Answer:

18,81,27,72,36,63,45,54,90

Step-by-step explanation:

1+8=9

8+1=9

2+7=9

7+2=9

3+6=9

6+3=9

4+5=9

5+4=9

9+0=9



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