The first term of an AP is 4 and the sum of the first three terms is 18. Find the product of the first three terms

Assessment: WAEC SSCE - Further Mathematics - 2021 (Objective) Subject: Further Mathematics

Question 1 Report

The first term of an AP is 4 and the sum of the first three terms is 18. Find the product of the first three terms

Answer Details
Let the common difference of the AP be denoted by d. Then, the first three terms of the AP are 4, 4 + d, and 4 + 2d, respectively. The sum of the first three terms of the AP is given as 18. Therefore, we have: 4 + (4 + d) + (4 + 2d) = 18 Simplifying the above equation, we get: 3d + 12 = 18 3d = 6 d = 2 Hence, the common difference of the AP is 2. Therefore, the first three terms of the AP are: 4, 6, 8 The product of the first three terms is: 4 x 6 x 8 = 192 Therefore, the answer is 192.

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