Question

Suppose there is a number 235 such that sum of first two digits is equal to the third digit. how many such 3 digits number are possible?

Answer 1

1. 123
2. 224
3. 347
4. 336
5. 134
6. 145
7. 156
8. 178
9. 189
10. 246
11. 257
12. 268
13. 279
14. 358
15. 369
16. 459
17. 426
18. 415
19. 516
20. 527
21. 538
22. 549
23. 617
24. 628
25. 639
26. 718
27. 729
28. 819

There are 28 such possible numbers