how many 3 digit number can be formed using 1,5,6,9 without repeating the number?
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Answer:
1. 156
2. 169
3.159
4.165
5.615
6. 516
7.195
8.519
9.915
10.569
11.659
12.965
13.956
14.596
15. 695...
And a lot more...
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