Q. 205.0( 2 Votes )

A gardener plans to construct a trapezoidal shaped structure in his garden. The longer side of trapezoid needs to start with a row of 97 bricks. Each row must be decreased by 2 bricks on each end and the construction should stop at 25th row. How many bricks does he need to buy?

Answer :


Longest side = 97

Each row decreases by = 2×2 = 4


Number of rows = 25


a = 97, d = –4, n = 25


Sum of n terms =


Sum of terms =


Sum of terms =


Sum of terms = 1225


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