AI

 Sure, let's try to get the number 813 using the given digits and basic arithmetic operations (+, -, /, *). Remember, you can use each digit only once:

1. Start with 100: 100

2. Multiply by 10: 100 * 10 = 1000

3. Subtract 75: 1000 - 75 = 925

4. Add 50: 925 + 50 = 975

5. Divide by 25: 975 / 25 = 39

6. Add 1: 39 + 1 = 40

7. Multiply by 10: 40 * 10 = 400

8. Add 75: 400 + 75 = 475

9. Add 100: 475 + 100 = 575

10. Multiply by 10: 575 * 10 = 5750

11. Subtract 50: 5750 - 50 = 5700

12. Add 25: 5700 + 25 = 5725

13. Add 10: 5725 + 10 = 5735

14. Add 1: 5735 + 1 = 5736

15. Multiply by 10: 5736 * 10 = 57360

16. Subtract 50: 57360 - 50 = 57310

17. Divide by 25: 57310 / 25 = 2292.4

18. Add 100: 2292.4 + 100 = 2392.4

19. Multiply by 10: 2392.4 * 10 = 23924

20. Add 50: 23924 + 50 = 23974

21. Add 1: 23974 + 1 = 23975

22. Multiply by 10: 23975 * 10 = 239750

23. Add 25: 239750 + 25 = 239775

24. Subtract 75: 239775 - 75 = 239700

25. Add 100: 239700 + 100 = 239800

26. Add 10: 239800 + 10 = 239810

27. Add 1: 239810 + 1 = 239811

28. Multiply by 10: 239811 * 10 = 2398110

29. Add 25: 2398110 + 25 = 2398135

30. Subtract 100: 2398135 - 100 = 2398035

31. Add 75: 2398035 + 75 = 2398110

32. Add 100: 2398110 + 100 = 2398210

33. Subtract 75: 2398210 - 75 = 2398135

After trying various combinations, it seems that there is no way to get the number 813 using the given digits and arithmetic operations (+, -, /, *) without repeating digits or using additional digits beyond the six provided.

_____________

75-10=65
65*25=1625
1625+1=1626
1626*50=81300
81300/100=813