Use the data referred to in 2.15, 2.16, and 2.19 to show that (a) (X +

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Use the data referred to in 2.15, 2.16, and 2.19 to show that
(a) Σ (X + Y) = ΣX + ΣY
(b) ΣXY ≠ ΣXΣY
(c) ΣCX = CΣX
(d) ΣX2 ≠ (ΣX)2
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