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Class 10MathematicsArithmetic Progressions (AP)Word problems based on APsEasy
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In an online course, (4) videos are watched on the first day and (2) more videos each next day. How many videos are watched on the (9)th day?

Answer and explanation

Correct answer: 20

The numbers of videos watched each day form an AP with first term \(a=4\), common difference \(d=2\), and \(n=9\). Thus, \(a_9=a+(n-1)d=4+(9-1)\times2=20\). Therefore, 20 is correct. The value 18 would represent the 8th-day term, not the 9th-day term. Exam tip: use \(n-1\), not \(n\), in the formula \(a_n=a+(n-1)d\).

Related tags

Arithmetic ProgressionAp Word ProblemsNth TermClass 10 MathematicsSequence ApplicationWord Problems Based On ApsArithmetic Progressions (Ap)Arithmetic Progressions Ap
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