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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 (d=7) and the sum of the (13)th to (24)th terms is (1602). What is the first term?

Answer and explanation

Correct answer: (11)

The selected (12) terms give (6(2a+245)=1602), so (a=11). Exam tip: treat the selected part as a separate AP.

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Ap Middle-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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