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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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In an arithmetic progression (t_{15}=65) and (S_{15}=555). What is the common difference?

Answer and explanation

Correct answer: (4)

From (555=\frac{15}{2}(a+65)), (a=9), and (d=\frac{65-9}{14}=4). Exam tip: use last term and sum to find the first term.

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Ap Term-And-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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