robert is thinking of a two digit number. the first digit can have any value from 1 to 8. the 2nd digit must not be same as the first. it can be any other digit from 1 to 8. which are the numbers that robert could be thinking of.
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12. 21. 31. 71
13. 23. 32. 72
14. 24. 34. 73
15. 25. 35. 74
16. 26. 36. 75
17. 27. 37. 76
18. 28. 38. 78
41. 51. 61. 81
42. 52. 62. 82
43. 53. 63. 83
45. 56. 64. 84
46. 57. 65. 85
47. 58. 67. 86
48. 54. 68. 87
These are the numbers that Robert could be thinking of
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