I have seven numbers: 1, 2, 3, 4, 5, 6, 7. five digit numbers which 15, 20, ... are multiples of 5.) If I use one number only once, how many different numbers can I make? I want to make are multiples of 5. (Note: 5, 10,

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Q: list the first five multiples of 13 after 13 itself.

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Q: A=[a,b;c,d]. A^2=[17,14;56,52].

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