दो क्रमागत विषम संख्याओं का गुणनफल 6723 है। बड़ी संख्या क्या है?

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JKSSB SI Official Paper (Held On: 11 Dec 2022 Shift 1)
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  1. 83
  2. 80
  3. 85
  4. 79

Answer (Detailed Solution Below)

Option 1 : 83
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दिया गया है:

दो क्रमागत विषम संख्याओं का गुणनफल 6723 है।

प्रयुक्त सूत्र:

(a + b)(a - b) = a2 - b2

गणना:

मान लीजिए छोटी संख्या 2x - 1 है और बड़ी संख्या 2x + 1 है।

(2x - 1)(2x + 1) = 6723

⇒ (2x)2 - 12 = 6723

⇒ 4x2 - 1 = 6723

⇒ 4x2 = 6724

⇒ x2 = 6724 / 4

⇒ x2 = 1681

⇒ x = √1681

⇒ x = 41

बड़ी संख्या (2x + 1):

2x + 1 = 2(41) + 1

⇒ 82 + 1 = 83

∴ बड़ी संख्या 83 है।

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