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Class 9 Mathematics Sequences and Progressions Arithmetic ProgressionExpert

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If in an arithmetic progression (a_2+a_8=70) and the common difference is (d=5), what is the first term (a_1)?

Answer and explanation

Correct answer: (15)

(a_2=a_1+5) and (a_8=a_1+35), so (2a_1+40=70) and (a_1=15). In sum-based questions, write both terms using (a_1) and (d).

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Sequences Progressions Arithmetic-Progression First-Term Arithmetic Progression Sequences And Progressions Mathematics Class 9 Mcq

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