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Class 10 Mathematics Arithmetic Progressions (AP)Finding the sum of the first (n) terms of an APEasy

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In a staircase, the number of bricks increases as (5,10,15,\ldots). How many bricks will be used in the first (9) levels?

Answer and explanation

Correct answer: (225)

This is the sum of the first (9) multiples of (5), so (5\times45=225). In word problems, treat levels as terms.

Related tags

Word Problem Bricks Ap Sum Finding The Sum Of The First (N) Terms Of An Ap Finding The Sum Of The First N Terms Of An Ap Arithmetic Progressions (Ap)Arithmetic Progressions Ap Mathematics

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