$1+2+3+\ldots+n$ बराबर है? $1+2+3+\ldots+n$ Baraber Hai?
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$1+2+3+\ldots+n$ बराबर है? $1+2+3+\ldots+n$ Bararber Hai?

(क) $\frac{n+1}{2}$

(ख) $\frac{n(n+1)(n+2)}{2}$

(ग) $\frac{n(n+1)}{2}$

(घ) $\frac{n(n-1)}{2}$

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Ans : उपरोक्त सभी विकल्पों में ऑप्शन (ग) का उत्तर सही होगा।

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