श्रेणी $\frac{1^3}{1} + \frac{1^3 + 2^3}{1 + 3} + \frac{1^3 + 2^3 + 3^3}{1 + 3 + 5} + \dots$ के $8$ पदों का योगफल क्या है?

  • A
    $70$
  • B
    $71$
  • C
    $72$
  • D
    $73$

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Similar Questions

$\sum\limits_{r = 1}^n {\sum\limits_{m = 1}^r {m} } = \dots$

Difficult
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मान लीजिए $\langle a_n \rangle$ एक अनुक्रम है ताकि $a_1+a_2+\ldots+a_n = \frac{n^2+3n}{(n+1)(n+2)}$। यदि $28 \sum_{k=1}^{10} \frac{1}{a_k} = p_1 p_2 p_3 \ldots p_m$ है,जहाँ $p_1, p_2, \ldots, p_m$ प्रथम $m$ अभाज्य संख्याएँ हैं,तो $m$ का मान ज्ञात कीजिए।

यदि $\sum\limits_{i = 1}^n {\sum\limits_{j = 1}^i {\sum\limits_{k = 1}^j {1 = 560} } } $ है,तो $n$ का मान ज्ञात कीजिए।

Difficult
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यदि $1 \cdot 3 \cdot 5 + 3 \cdot 5 \cdot 7 + 5 \cdot 7 \cdot 9 + \ldots n$ पद $= n(n+1) f(n) - 3n$ है,तो $f(1) =$

$2.\overline{357} = $

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