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Arithmetic Progressions

Question 5:

A small terrace at a football ground comprises of 15 steps each of which is 50 m long and built of solid concrete.

Each step has a rise of m and a tread of m (See figure) calculate the total volume of concrete required to build the terrace.

Answer:

From the figure, it can be observed that

1st step is m wide,

2nd step is 1 m wide,

3rd step is m wide.

Therefore, the width of each step is increas…

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