a₁ = 101 d = - 10 a₁₀ * a₁₅ = ?
a₁₀ = a₁ + 9d = 101 + 9 * ( - 10) = 101 - 90 = 11
a₁₅ = a₁ + 14d = 101 + 14 * (- 10) = 101 - 140 = - 39
a₁₀ * a₁₅ = 11 * (- 39) = - 429
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a₁ = 101 d = - 10 a₁₀ * a₁₅ = ?
a₁₀ = a₁ + 9d = 101 + 9 * ( - 10) = 101 - 90 = 11
a₁₅ = a₁ + 14d = 101 + 14 * (- 10) = 101 - 140 = - 39
a₁₀ * a₁₅ = 11 * (- 39) = - 429