Solution 11:

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• Question 11:
• In a sequence where the first term is 3 and the common difference is 4, find the sum of the first 15 terms.
• First term \( a = 3 \), common difference \( d = 4 \), number of terms \( n = 15 \).
• Sum of an arithmetic sequence:
• S_n = \frac{n}{2} \left(2a + (n-1)d\right)

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