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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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How many first terms of the arithmetic progression (21,27,33,\ldots) have sum (1425)?

Answer and explanation

Correct answer: (19)

(S_n=3n(n+6)), and substituting (n=19) gives (1425). Exam tip: options can be checked quickly too.

Related tags

Ap Find-Number-Of-Terms 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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