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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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The average of the first (30) terms of an arithmetic progression is (76) and the first term is (18). What is the common difference?

Answer and explanation

Correct answer: (4)

The last term is (134), so (d=\frac{134-18}{29}=4). Exam tip: connect the average with the average of first and last terms.

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Ap Average 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 Mathematics

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