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Sum = ½ × number of numbers × (first number + last number) = ½ × (462 - 408 + 1) × (408 + 462) = ½ × 55 × 870 = 23,925
(Positive 462) + (Negative 462) = 0
No - 462/12 = 38.5
51.3333
2x21x11