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sum = 1/2 x number_of_terms x (first + last)

number_of_terms = (last - first) ÷ difference + 1

= (25 - 0.5) ÷ 3.5 + 1

= 8

⇒ sum = 1/2 x 8 x (0.5 + 25)

= 102

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