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A student starts with (15) minutes of practice per day and increases it by (5) minutes every day. What is the total practice time in (14) days?एक छात्र प्रतिदिन (15) मिनट से शुरू करके हर दिन (5) मिनट अधिक अभ्यास करता है। (14) दिनों में कुल अभ्यास समय कितना होगा?
Answer and explanationउत्तर और व्याख्या
Correct answer:सही उत्तर: (665)(665)
This is the AP (15,20,25,\ldots), and the sum for (14) days is (665) minutes. In word problems, treat days as the number of terms.यह (15,20,25,\ldots) श्रेढ़ी है और (14) दिनों का योग (665) मिनट है। शब्द-प्रश्न में दिन को पदों की संख्या मानें।
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