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Q:

यदि 0.4 m + 0.8 n = 2.2 और 0.8 m + 0.4 n = 1.4, हो, तो $$ {m^2}+{n^2}$$का मान क्‍या हाेगा?

  • 1
    8.5
  • 2
    6.5
  • 3
    16
  • 4
    9
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Answer : 2. "6.5"

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