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On a mobile app (120) users joined on the first day and (30) more users joined each next day. How many users join in (6) days?

Answer and explanation

Correct answer: 1170

This is an arithmetic progression with first term \(a=120\), common difference \(d=30\), and number of terms \(n=6\). Thus, \(S_6=\frac{6}{2}[2(120)+(6-1)30]=3(390)=1170\). Therefore, a total of 1170 users join in 6 days. The option 1200 can result from an addition or multiplication error. Exam tip: In AP word problems, first identify \(a\), \(d\), and \(n\), then apply the formula for \(S_n\).

Related tags

Arithmetic ProgressionAp Word ProblemsSum Of ApNth TermClass 10 MathematicsWord Problems Based On ApsArithmetic Progressions (Ap)Arithmetic Progressions Ap

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