गुणोत्तर श्रेणी $5+25+125+\ldots$ का $10$ वाँ पद ज्ञात कीजिए।

  • A
    $5^{10}$
  • B
    $5^{9}$
  • C
    $5^{11}$
  • D
    $5^{8}$

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यदि ${a_1}, {a_2}, {a_3}, ..., {a_{24}}$ समांतर श्रेणी में हैं और ${a_1} + {a_5} + {a_{10}} + {a_{15}} + {a_{20}} + {a_{24}} = 225$ है,तो ${a_1} + {a_2} + {a_3} + ... + {a_{23}} + {a_{24}} = $

योगफल $11^{2} + 12^{2} + \cdots + 20^{2} + 21^{2} = ?$

यदि $1 + \sin x + \sin^2 x + \dots \infty = 4 + 2\sqrt{3}$,जहाँ $0 < x < \pi$,तो:

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श्रेणी $\frac{1}{\sqrt{1} + \sqrt{2}} + \frac{1}{\sqrt{2} + \sqrt{3}} + \frac{1}{\sqrt{3} + \sqrt{4}} + ... + \frac{1}{\sqrt{n^2 - 1} + \sqrt{n^2}}$ का योग किसके बराबर है?

यदि समीकरण $x^3 - 9x^2 + \alpha x - 15 = 0$ के मूल $A.P.$ (समांतर श्रेणी) में हैं,तो $\alpha$ का मान ज्ञात कीजिए।

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