Excluding zero, the fifth multiple is 25.
(5, 10, 15, 20, 25)
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The fifth multiple of four is twenty. 5 * 4 = 20
15 is. Intriguingly, it's also the 3rd multiple of 5.
It is: 5*5 = 25
lcm(2, 7) = 14 5th multiple is 5 x 14 = 70
So the first multiple is 1 x 8 = 8. The fifth multiple is 5 x 8 = 40.