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S33 = 891
a = 7
Sn = ½ n (a + Un)
S33 = ½ . 33 (a + U33)
S33 = 33/2 ( 7 + U33)
891 = 33/2 (7 + U33)
891 . 2/33 = 7 + U33
54 = 7 + U33
U33 = 47