well the first four terms are n=1,2,3 and 4
so just substitute those numbers into k=3n
so k= 3,6,9,12
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2
6
If that's the negative of negative four, it equals positive four.
5
Four times five is equal to twenty. This can be calculated by adding four fives together, which equals twenty. In mathematical terms, this can be written as 4 x 5 = 20.