Sn = n/2 . (a + Un)
S6 = 6/2 . (6 + 192)
S6 = 3 . 198
S6 = 594 cm
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Sn = n/2 . (a + Un)
S6 = 6/2 . (6 + 192)
S6 = 3 . 198
S6 = 594 cm