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Class 9 Mathematics Sequences and Progressions Arithmetic ProgressionExpert

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If (a_1=4) and (d=9), what is the value of (a_{15}-a_9)?

Answer and explanation

Correct answer: (54)

There are (6) gaps between (a_{15}) and (a_9), so the difference is (6\times9=54). Term differences can be found directly using (d).

Related tags

Sequences Progressions Arithmetic-Progression Difference-Of-Terms Arithmetic Progression Sequences And Progressions Mathematics Class 9 Mcq

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