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Verified answer
DeRet AritmatikaU4 = 5
U7 = 14
b = (U7 - U4)/(7 - 4)
b = (14 - 5)/3
b = 9/3
b = 3
U4 = 5
a + 3b = 5
a + 3.3 = 5
a = 5 - 9
a = -4
Sn = n/2 (2a + (n - 1)b)
S25 = 25/2 (2(-4) + 24 . 3)
S25 = 25/2 (-8 + 72)
S25 = 25/2 × 64
S25 = 25 × 32
S25 = 800