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Use the Formula for the Sum of the First N

Question 122

Multiple Choice

Use the formula for the sum of the first n terms of an arithmetic sequence to find the indicated sum.
-A brick staircase has a total of 18 steps The bottom step requires 101 bricks. Each successive step requires 4 fewer bricks than the prior one. How many bricks are required to build the staircase?


A) 1206 bricks
B) 2430 bricks
C) 2412 bricks
D) 1170 bricks

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