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For which (n) will (S_n-S_{n-3}=144)?किस (n) के लिए (S_n-S_{n-3}=144) होगा?
Answer and explanationउत्तर और व्याख्या
Correct answer:सही उत्तर: (49)(49)
(S_n-S_{n-3}=(n-2)+(n-1)+n=3n-3), so (3n-3=144) gives (n=49). Write the difference as the last three terms.(S_n-S_{n-3}=(n-2)+(n-1)+n=3n-3) है, इसलिए (3n-3=144) से (n=49)। अंतर को अंतिम तीन पदों के रूप में लिखें।
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