15, 10, 5, . . . In this A.P. sum of first 10 terms is . . .
Choose the correct alternative answer.
15, 10, 5, . . . In this A.P. sum of first 10 terms is . . .
(A) −75 (B) −125 (C) 75 (D) 125
1 answer
Answer: (A) −75
\(a = 15, d = -5\): \(S_{10} = 5[30 + 9(-5)] = 5(-15) = -75\).
Doubtly AI
· 24 Oct 2026
AI-verified · Oct 2026
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