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

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If (a=25), (d=-4), and (S_n=105), what is the correct positive value of (n)?

Answer and explanation

Correct answer: (7)

From (\frac{n}{2}[50-4(n-1)]=105), (n=7). Even in a decreasing AP, (n) must be a positive integer.

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Negative Difference Find N 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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