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Determine cube root of the number 13824 by observation method.

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Best answer

13824 = 2 × 2 × 2 × 2 × 2 × 2 × 2 × 2 × 2 × 3 × 3 × 3

⇒ 3√13824

= 3√2× 33

= 3√(23)× 33

= 2× 3 = 24

∴ 3√13824 = 24

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