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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 (5)th term of an arithmetic progression is (22) and the (15)th term is (62). What is the sum of the first (15) terms?

Answer and explanation

Correct answer: (510)

The two terms give (d=4) and (a=6), so (S_{15}=510). Exam tip: first find (d) from the difference of two given terms.

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Ap Two-Terms-Sum 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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