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What is the value of (S_{88}+S_{90}-2S_{89})?(S_{88}+S_{90}-2S_{89}) का मान क्या है?
Answer and explanationउत्तर और व्याख्या
Correct answer:सही उत्तर: (1)(1)
(S_{90}=S_{89}+90) and (S_{88}=S_{89}-89), so the value is (1). Use differences of consecutive sums.(S_{90}=S_{89}+90) और (S_{88}=S_{89}-89) है इसलिए मान (1) है। लगातार योगों के अंतर का उपयोग करें।
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