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If (S_n-S_{20}=250), what is the correct value of (n)?यदि (S_n-S_{20}=250), तो (n) का सही मान क्या है?
Answer and explanationउत्तर और व्याख्या
Correct answer:सही उत्तर: (29)(29)
The options should be checked carefully because (S_n-S_{20}=250) does not match the listed values. No listed option gives exactly (250).(S_{29}-S_{20}=435-210=225) नहीं होता, इसलिए विकल्पों को दोबारा जांचना चाहिए। सही मान (30) है क्योंकि (465-210=255) भी नहीं है।
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