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Find the sum of the first (12) terms of the AP (100,95,90,\ldots).समांतर श्रेढ़ी (100,95,90,\ldots) के पहले (12) पदों का योग ज्ञात कीजिए।
Answer and explanationउत्तर और व्याख्या
Correct answer:सही उत्तर: (870)(870)
The last term is (45), so (S_{12}=\frac{12}{2}(100+45)=870). Once the last term is found, the sum is quick.अंतिम पद (45) है, इसलिए (S_{12}=\frac{12}{2}(100+45)=870)। अंतिम पद मिल जाए तो योग तेजी से निकलेगा।
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