2/5 x 8 and 1/8:
2/5 x 65/8 = 13/4 = 3 and 1/4
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2/5 x 1/8 = 2/40 = 1/20 one twentieth
.8 = 4/5 .125= 1/8 .8/.125= 6.4=6 2/5 .125/.8=.15629
The sum of 4/5 and 1/8 is 37/40
1/8 + 1/8 = 2/8 = 1/4
One possible answer is: Un = (3n3 - 3n2 + 78n - 8)/560 for n = 1, 2, 3, 4.