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Find the sum of the first 15 terms of the arithmetic progression: 2, 5, 8, ...

Competition practiceAlgebra

A345
B335
C350
D330

Step-by-Step Solution

a = 2, d = 3, n = 15. S = (n /2) [2 a + (n - 1) d] = (15/2) [4 + 42] = (15/2) (46) = 345

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Answer: A) 345

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