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a = 17
U5 = 53
Sn = n/2 (a+Un)
S5 = 5/2 (17+53)
= 5/2 (70)
= 5x35
= 175
a = 17
U5 = 53
Sn = n/2 (a+Un)
S5 = 5/2 (17+53)
= 5/2 (70)
= 5x35
= 175