1. (D) 7/11 Since u = 0, so using, S, = u + a (n – 1/2) s₁ = 0 + 7a/2 = 7a/2 s₂ = 0 + 11a/2 = 11a /2 s₁/ s₂ = 7/11

    (D) 7/11
    Since u = 0, so using,
    S, = u + a (n – 1/2)
    s₁ = 0 + 7a/2 = 7a/2
    s₂ = 0 + 11a/2 = 11a /2
    s₁/ s₂ = 7/11

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