यदि x + 1/y = 3, y + 1/z = 2 और z + 1/x = 4 है, तो xyz + 1/xyz का मान ज्ञात कीजिये।

  1. 15
  2. 25
  3. 10
  4. 20

Answer (Detailed Solution Below)

Option 1 : 15
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गणना:

x + 1/y = 3      ----(1) 

y + 1/z = 2      ----(2) 

z + 1/x = 4      ----(3)

समीकरण (1), (2) and (3) का योग करने पर

⇒ x + y + z + 1/x + 1/y + 1/z = 9      ----(4)

अब समीकरण (1), (2) और (3) को गुणा करने पर

⇒ (x + 1/y) × (y + 1/z) × (z + 1/x) = 3 × 2 × 4

⇒ (xy + x/z + 1 + 1/zy)(z + 1/x) = 24

⇒ (xyz + y + x + 1/z + z + 1/x + 1/y + 1/xyz) = 24

⇒ [xyz + (1/xyz) + x + y + z + 1/x + 1/y + 1/z] = 24

⇒ xyz + 1/xyz + 9 = 24 

⇒ xyz + 1/xyz = 24 – 9 = 15

∴ उत्तर 15 है।

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