Add 2 to the number before.
So it continues
15 17 19 21 23 25
and so on ..
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Un = 4n - 13.
13
A number is a multiple of 741 if it's a multiple of 3, 13 and 19 at the same time 741 = 3 x 13 x 19
> 1, 3, 5, 7, 11, 13, and 17 1 is not a prime number, but 2 and 19 are. The correct answer is 2, 3, 5, 7, 11, 13, 17, and 19.
There are 10 possible combinations so 60 possible permutations. The combinations are:(1, 3, 21), (1, 5, 19), (1, 7, 17), (1, 9, 15), (1, 11, 13),(3, 5, 17), (3, 7, 15), (3, 9, 13), (5, 7, 13), (5, 9, 11).