Sum = ½ × number of numbers × (first number + last number)
= ½ × (462 - 408 + 1) × (408 + 462)
= ½ × 55 × 870
= 23,925
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(Positive 462) + (Negative 462) = 0
51.3333
2x21x11
462 x 2
61 + 67 + 71 + 73 + 79 + 83 + 89 + 97 = 128 + 223 + 269 = 620 unless 61 and 97 are not included then 462