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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 the sum of the first (20) terms of an AP is (780) and the first term is (5), what is the common difference (d)?

Answer and explanation

Correct answer: (4)

From (780=10[10+19d]), (d=4). When sum and first term are given, the common difference can be found directly.

Related tags

Find Common Difference 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 Class 10 Mcq

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