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U7 = U1 + 6b = 29 -
-4b = -16
b = 4.
U3 = U1 + 2b
13 = U1 + 8
5 = U1.
Sn = 1/2n [2U1 + (n-1)b]
S25 = 25/2 (10 + 96)
= 25/2 (106)
= 1.325.