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Sum_ap = ½ × number_of_terms × (first_term + last_term)

For the first 88 multiples of three:

number_of_terms = 88

first_term = 1 × 3 = 3

last_term = 88 × 3 = 264

→ Sum = ½ × 88 × (3 + 264) = 44 × 267 = 11748

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7y ago

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