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18 এবং 72 এর গুণোত্তর গড় কোনটি?

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  • (ক) 45
  • (খ) 1296
  • (গ) 36
  • (ঘ) 4

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আমরা জানি, গুণোত্তর গড় = $\sqrt[n]{x_1 \cdot x_2 \cdot x_3 \dots x_n}$

তাহলে, $18$ ও $72$ সংখ্যা দুইটির গুণোত্তর গড়
$= \sqrt {18 \times 72}$

$= \sqrt {(9 \times 2) \times (36 \times 2)}$

$= \sqrt {9 \times 2 \times 36 \times 2}$

$= \sqrt {9 \times 36 \times 4}$

$= \sqrt {3^2 \times 6^2 \times 2^2}$

$= \sqrt {(3 \times 6 \times 2)^2}$

$= 3 \times 6 \times 2$

$= 36$

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