Answer: \(t_{28} = 60\)
\[S_{55} = \frac{55}{2}[2a + 54d]\]\[= 55(a + 27d) = 55\,t_{28}\]\[55\,t_{28} = 3300\]\[t_{28} = 60\]1 answer
Doubtly AI
· 24 Oct 2026
AI-verified · Oct 2026
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