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a = 2 ¹/₂ = 5/2
b = 5 - 2¹/₂ = 2¹/₂ = 5/2
U27= a + 16b = 5/2 + 16(5/2) = 5/2 + 40 = 42 ¹/₂
s27 = 27/2 ( a + U27)
s27 = 27/2 ( 2¹/₂ + 42¹/₂)
s27 = 27/2 (45) = 607 ¹/₂
..
(-3/4) + (-1/2) + (-1/4) + ...
a= -3/4
b = 1/4
U35 = a + 34 b = -3/4 + 34(1/4) = -3/4 + 34/4 = 30/4 = 7¹/₂
s35 = 35/2 (a + U35)
s35 = 35/2 (-3/4 + 30/4)
s35 = 35/2 (27/4)= 118 ¹/₈