Sn = 95
n/2 . (a + Un) = 95
5/2 . (15 + Un) = 95
15 + Un = 95 x 2/5
Un = 38 - 15
Un = 23 cm
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Sn = 95
n/2 . (a + Un) = 95
5/2 . (15 + Un) = 95
15 + Un = 95 x 2/5
Un = 38 - 15
Un = 23 cm