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In a mobile data plan, 3 GB of data is given on the first day and 2 GB more is given each successive day. How much data is given on the 15th day?

Answer and explanation

Correct answer: 31 जीबी

The governing concept is the nth term of an arithmetic progression. The daily amounts are 3, 5, 7, and so on, so the first term is a = 3, the common difference is d = 2, and the required term is n = 15. Using aₙ = a + (n − 1)d, we get a₁₅ = 3 + (15 − 1) × 2 = 3 + 28 = 31 GB. Hence option B is correct. The question asks for the amount on one particular day, so summing all fifteen days would be inappropriate. Option A uses too little increase, while 33 and 35 use excess increase or treat the first day as an additional step. Counting fourteen increments after day one is the essential point.

Related tags

Arithmetic ProgressionAp Nth TermData PlanWord ProblemClass 10 MathematicsWord Problems Based On ApsArithmetic Progressions (Ap)Arithmetic Progressions Ap

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