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If (1+2+3+\cdots+n=903), choose the value of (n).यदि (1+2+3+\cdots+n=903) है तो (n) का मान चुनिए।
Answer and explanationउत्तर और व्याख्या
Correct answer:सही उत्तर: (42)(42)
(S_{42}=\frac{42\times43}{2}=903), so (n=42). Use (2S_n) to see the product of two consecutive numbers.(S_{42}=\frac{42\times43}{2}=903) इसलिए (n=42)। (2S_n) करके दो क्रमागत संख्याओं का गुणनफल देखें।
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