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

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In an arithmetic progression (a=18) and (d=-4). How many first terms have sum (144)?

Answer and explanation

Correct answer: (9)

Using the sum formula gives (n=9). Exam tip: even in a decreasing AP, take the positive value of (n).

Related tags

Ap Find-N Decreasing Expert 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

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