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If an AP has (a=-50), (d=15), and (n=45), what is the value of (S_{45})?यदि किसी समांतर श्रेढ़ी में (a=-50), (d=15) और (n=45), तो (S_{45}) का मान क्या होगा?
Answer and explanationउत्तर और व्याख्या
Correct answer:सही उत्तर: (12600)(12600)
The formula gives (S_{45}=\frac{45}{2}[-100+660]=12600). Keep the sign of the negative first term carefully.सूत्र से (S_{45}=\frac{45}{2}[-100+660]=12600) मिलता है। ऋणात्मक पहले पद का संकेत ध्यान से रखें।
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